一运算符
1算数运算符
2.比较运算符
3.赋值运算符
4.逻辑运算符
二.基本数据类型
1.数字
数字 age = 123
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
1 复制代码 2 class int(object): 3 """ 4 int(x=0) -> int or long 5 int(x, base=10) -> int or long 6 7 Convert a number or string to an integer, or return 0 if no arguments 8 are given. If x is floating point, the conversion truncates towards zero. 9 If x is outside the integer range, the function returns a long instead. 10 11 If x is not a number or if base is given, then x must be a string or 12 Unicode object representing an integer literal in the given base. The 13 literal can be preceded by '+' or '-' and be surrounded by whitespace. 14 The base defaults to 10. Valid bases are 0 and 2-36. Base 0 means to 15 interpret the base from the string as an integer literal. 16 >>> int('0b100', base=0) 17 4 18 """ 19 def bit_length(self): 20 """ 返回表示该数字的时占用的最少位数 """ 21 """ 22 int.bit_length() -> int 23 24 Number of bits necessary to represent self in binary. 25 >>> bin(37) 26 '0b100101' 27 >>> (37).bit_length() 28 6 29 """ 30 return 0 31 32 def conjugate(self, *args, **kwargs): # real signature unknown 33 """ 返回该复数的共轭复数 """ 34 """ Returns self, the complex conjugate of any int. """ 35 pass 36 37 def __abs__(self): 38 """ 返回绝对值 """ 39 """ x.__abs__() <==> abs(x) """ 40 pass 41 42 def __add__(self, y): 43 """ x.__add__(y) <==> x+y """ 44 pass 45 46 def __and__(self, y): 47 """ x.__and__(y) <==> x&y """ 48 pass 49 50 def __cmp__(self, y): 51 """ 比较两个数大小 """ 52 """ x.__cmp__(y) <==> cmp(x,y) """ 53 pass 54 55 def __coerce__(self, y): 56 """ 强制生成一个元组 """ 57 """ x.__coerce__(y) <==> coerce(x, y) """ 58 pass 59 60 def __divmod__(self, y): 61 """ 相除,得到商和余数组成的元组 """ 62 """ x.__divmod__(y) <==> divmod(x, y) """ 63 pass 64 65 def __div__(self, y): 66 """ x.__div__(y) <==> x/y """ 67 pass 68 69 def __float__(self): 70 """ 转换为浮点类型 """ 71 """ x.__float__() <==> float(x) """ 72 pass 73 74 def __floordiv__(self, y): 75 """ x.__floordiv__(y) <==> x//y """ 76 pass 77 78 def __format__(self, *args, **kwargs): # real signature unknown 79 pass 80 81 def __getattribute__(self, name): 82 """ x.__getattribute__('name') <==> x.name """ 83 pass 84 85 def __getnewargs__(self, *args, **kwargs): # real signature unknown 86 """ 内部调用 __new__方法或创建对象时传入参数使用 """ 87 pass 88 89 def __hash__(self): 90 """如果对象object为哈希表类型,返回对象object的哈希值。哈希值为整数。在字典查找中,哈希值用于快速比较字典的键。两个数值如果相等,则哈希值也相等。""" 91 """ x.__hash__() <==> hash(x) """ 92 pass 93 94 def __hex__(self): 95 """ 返回当前数的 十六进制 表示 """ 96 """ x.__hex__() <==> hex(x) """ 97 pass 98 99 def __index__(self): 100 """ 用于切片,数字无意义 """ 101 """ x[y:z] <==> x[y.__index__():z.__index__()] """ 102 pass 103 104 def __init__(self, x, base=10): # known special case of int.__init__ 105 """ 构造方法,执行 x = 123 或 x = int(10) 时,自动调用,暂时忽略 """ 106 """ 107 int(x=0) -> int or long 108 int(x, base=10) -> int or long 109 110 Convert a number or string to an integer, or return 0 if no arguments 111 are given. If x is floating point, the conversion truncates towards zero. 112 If x is outside the integer range, the function returns a long instead. 113 114 If x is not a number or if base is given, then x must be a string or 115 Unicode object representing an integer literal in the given base. The 116 literal can be preceded by '+' or '-' and be surrounded by whitespace. 117 The base defaults to 10. Valid bases are 0 and 2-36. Base 0 means to 118 interpret the base from the string as an integer literal. 119 >>> int('0b100', base=0) 120 4 121 # (copied from class doc) 122 """ 123 pass 124 125 def __int__(self): 126 """ 转换为整数 """ 127 """ x.__int__() <==> int(x) """ 128 pass 129 130 def __invert__(self): 131 """ x.__invert__() <==> ~x """ 132 pass 133 134 def __long__(self): 135 """ 转换为长整数 """ 136 """ x.__long__() <==> long(x) """ 137 pass 138 139 def __lshift__(self, y): 140 """ x.__lshift__(y) <==> x<<y """ 141 pass 142 143 def __mod__(self, y): 144 """ x.__mod__(y) <==> x%y """ 145 pass 146 147 def __mul__(self, y): 148 """ x.__mul__(y) <==> x*y """ 149 pass 150 151 def __neg__(self): 152 """ x.__neg__() <==> -x """ 153 pass 154 155 @staticmethod # known case of __new__ 156 def __new__(S, *more): 157 """ T.__new__(S, ...) -> a new object with type S, a subtype of T """ 158 pass 159 160 def __nonzero__(self): 161 """ x.__nonzero__() <==> x != 0 """ 162 pass 163 164 def __oct__(self): 165 """ 返回改值的 八进制 表示 """ 166 """ x.__oct__() <==> oct(x) """ 167 pass 168 169 def __or__(self, y): 170 """ x.__or__(y) <==> x|y """ 171 pass 172 173 def __pos__(self): 174 """ x.__pos__() <==> +x """ 175 pass 176 177 def __pow__(self, y, z=None): 178 """ 幂,次方 """ 179 """ x.__pow__(y[, z]) <==> pow(x, y[, z]) """ 180 pass 181 182 def __radd__(self, y): 183 """ x.__radd__(y) <==> y+x """ 184 pass 185 186 def __rand__(self, y): 187 """ x.__rand__(y) <==> y&x """ 188 pass 189 190 def __rdivmod__(self, y): 191 """ x.__rdivmod__(y) <==> divmod(y, x) """ 192 pass 193 194 def __rdiv__(self, y): 195 """ x.__rdiv__(y) <==> y/x """ 196 pass 197 198 def __repr__(self): 199 """转化为解释器可读取的形式 """ 200 """ x.__repr__() <==> repr(x) """ 201 pass 202 203 def __str__(self): 204 """转换为人阅读的形式,如果没有适于人阅读的解释形式的话,则返回解释器课阅读的形式""" 205 """ x.__str__() <==> str(x) """ 206 pass 207 208 def __rfloordiv__(self, y): 209 """ x.__rfloordiv__(y) <==> y//x """ 210 pass 211 212 def __rlshift__(self, y): 213 """ x.__rlshift__(y) <==> y<<x """ 214 pass 215 216 def __rmod__(self, y): 217 """ x.__rmod__(y) <==> y%x """ 218 pass 219 220 def __rmul__(self, y): 221 """ x.__rmul__(y) <==> y*x """ 222 pass 223 224 def __ror__(self, y): 225 """ x.__ror__(y) <==> y|x """ 226 pass 227 228 def __rpow__(self, x, z=None): 229 """ y.__rpow__(x[, z]) <==> pow(x, y[, z]) """ 230 pass 231 232 def __rrshift__(self, y): 233 """ x.__rrshift__(y) <==> y>>x """ 234 pass 235 236 def __rshift__(self, y): 237 """ x.__rshift__(y) <==> x>>y """ 238 pass 239 240 def __rsub__(self, y): 241 """ x.__rsub__(y) <==> y-x """ 242 pass 243 244 def __rtruediv__(self, y): 245 """ x.__rtruediv__(y) <==> y/x """ 246 pass 247 248 def __rxor__(self, y): 249 """ x.__rxor__(y) <==> y^x """ 250 pass 251 252 def __sub__(self, y): 253 """ x.__sub__(y) <==> x-y """ 254 pass 255 256 def __truediv__(self, y): 257 """ x.__truediv__(y) <==> x/y """ 258 pass 259 260 def __trunc__(self, *args, **kwargs): 261 """ 返回数值被截取为整形的值,在整形中无意义 """ 262 pass 263 264 def __xor__(self, y): 265 """ x.__xor__(y) <==> x^y """ 266 pass 267 268 denominator = property(lambda self: object(), lambda self, v: None, lambda self: None) # default 269 """ 分母 = 1 """ 270 """the denominator of a rational number in lowest terms""" 271 272 imag = property(lambda self: object(), lambda self, v: None, lambda self: None) # default 273 """ 虚数,无意义 """ 274 """the imaginary part of a complex number""" 275 276 numerator = property(lambda self: object(), lambda self, v: None, lambda self: None) # default 277 """ 分子 = 数字大小 """ 278 """the numerator of a rational number in lowest terms""" 279 280 real = property(lambda self: object(), lambda self, v: None, lambda self: None) # default 281 """ 实属,无意义 """ 282 """the real part of a complex number"""
indetationError 缩进错误
一个等号是赋值,两个等号是比较。
2.字符串
a1='abs'
a2="sdf"
a3="""nsdfis"""
字符串方法:
S = "guifeng"
capitalize() # 首字母变大写
S.capitalize()
def center(self, width, fillchar=None): """ 内容居中,width:总长度;fillchar:空白处填充内容,默认无 """
def count(self, sub, start=None, end=None): """ 子序列个数 """ """ S.count(sub[, start[, end]]) -> int
def decode(self, encoding=None, errors=None): """ 解码 """
def encode(self, encoding=None, errors=None): """ 编码,针对unicode """
def endswith(self, suffix, start=None, end=None): """ 是否以 xxx 结束 """
def expandtabs(self, tabsize=None): """ 将tab转换成空格,默认一个tab转换成8个空格 """
def find(self, sub, start=None, end=None): """ 寻找子序列位置,如果没找到,返回 -1 """
def isalnum(self): """ 是否是字母和数字 """
def isalpha(self): """ 是否是字母 """
def isdigit(self): """ 是否是数字 """
def islower(self): """ 是否小写 """
def join(self, iterable): """ 连接 """
def ljust(self, width, fillchar=None):
""" 内容左对齐,右侧填充 """
def lower(self): """ 变小写 """
def lstrip(self, chars=None): """ 移除左侧空白 """
def partition(self, sep): """ 分割,前,中,后三部分 """ """ S.partition(sep) -> (head, sep, tail)
def replace(self, old, new, count=None): """ 替换 """
def startswith(self, prefix, start=None, end=None): """ 是否起始 """
def strip(self, chars=None): """ 移除两段空白 """
def swapcase(self): """ 大写变小写,小写变大写 """
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
class str(basestring): """ str(object='') -> string Return a nice string representation of the object. If the argument is a string, the return value is the same object. """ def capitalize(self): """ 首字母变大写 """ """ S.capitalize() -> string Return a copy of the string S with only its first character capitalized. """ return "" def center(self, width, fillchar=None): """ 内容居中,width:总长度;fillchar:空白处填充内容,默认无 """ """ S.center(width[, fillchar]) -> string Return S centered in a string of length width. Padding is done using the specified fill character (default is a space) """ return "" def count(self, sub, start=None, end=None): """ 子序列个数 """ """ S.count(sub[, start[, end]]) -> int Return the number of non-overlapping occurrences of substring sub in string S[start:end]. Optional arguments start and end are interpreted as in slice notation. """ return 0 def decode(self, encoding=None, errors=None): """ 解码 """ """ S.decode([encoding[,errors]]) -> object Decodes S using the codec registered for encoding. encoding defaults to the default encoding. errors may be given to set a different error handling scheme. Default is 'strict' meaning that encoding errors raise a UnicodeDecodeError. Other possible values are 'ignore' and 'replace' as well as any other name registered with codecs.register_error that is able to handle UnicodeDecodeErrors. """ return object() def encode(self, encoding=None, errors=None): """ 编码,针对unicode """ """ S.encode([encoding[,errors]]) -> object Encodes S using the codec registered for encoding. encoding defaults to the default encoding. errors may be given to set a different error handling scheme. Default is 'strict' meaning that encoding errors raise a UnicodeEncodeError. Other possible values are 'ignore', 'replace' and 'xmlcharrefreplace' as well as any other name registered with codecs.register_error that is able to handle UnicodeEncodeErrors. """ return object() def endswith(self, suffix, start=None, end=None): """ 是否以 xxx 结束 """ """ S.endswith(suffix[, start[, end]]) -> bool Return True if S ends with the specified suffix, False otherwise. With optional start, test S beginning at that position. With optional end, stop comparing S at that position. suffix can also be a tuple of strings to try. """ return False def expandtabs(self, tabsize=None): """ 将tab转换成空格,默认一个tab转换成8个空格 """ """ S.expandtabs([tabsize]) -> string Return a copy of S where all tab characters are expanded using spaces. If tabsize is not given, a tab size of 8 characters is assumed. """ return "" def find(self, sub, start=None, end=None): """ 寻找子序列位置,如果没找到,返回 -1 """ """ S.find(sub [,start [,end]]) -> int Return the lowest index in S where substring sub is found, such that sub is contained within S[start:end]. Optional arguments start and end are interpreted as in slice notation. Return -1 on failure. """ return 0 def format(*args, **kwargs): # known special case of str.format """ 字符串格式化,动态参数,将函数式编程时细说 """ """ S.format(*args, **kwargs) -> string Return a formatted version of S, using substitutions from args and kwargs. The substitutions are identified by braces ('{' and '}'). """ pass def index(self, sub, start=None, end=None): """ 子序列位置,如果没找到,报错 """ S.index(sub [,start [,end]]) -> int Like S.find() but raise ValueError when the substring is not found. """ return 0 def isalnum(self): """ 是否是字母和数字 """ """ S.isalnum() -> bool Return True if all characters in S are alphanumeric and there is at least one character in S, False otherwise. """ return False def isalpha(self): """ 是否是字母 """ """ S.isalpha() -> bool Return True if all characters in S are alphabetic and there is at least one character in S, False otherwise. """ return False def isdigit(self): """ 是否是数字 """ """ S.isdigit() -> bool Return True if all characters in S are digits and there is at least one character in S, False otherwise. """ return False def islower(self): """ 是否小写 """ """ S.islower() -> bool Return True if all cased characters in S are lowercase and there is at least one cased character in S, False otherwise. """ return False def isspace(self): """ S.isspace() -> bool Return True if all characters in S are whitespace and there is at least one character in S, False otherwise. """ return False def istitle(self): """ S.istitle() -> bool Return True if S is a titlecased string and there is at least one character in S, i.e. uppercase characters may only follow uncased characters and lowercase characters only cased ones. Return False otherwise. """ return False def isupper(self): """ S.isupper() -> bool Return True if all cased characters in S are uppercase and there is at least one cased character in S, False otherwise. """ return False def join(self, iterable): """ 连接 """ """ S.join(iterable) -> string Return a string which is the concatenation of the strings in the iterable. The separator between elements is S. """ return "" def ljust(self, width, fillchar=None): """ 内容左对齐,右侧填充 """ """ S.ljust(width[, fillchar]) -> string Return S left-justified in a string of length width. Padding is done using the specified fill character (default is a space). """ return "" def lower(self): """ 变小写 """ """ S.lower() -> string Return a copy of the string S converted to lowercase. """ return "" def lstrip(self, chars=None): """ 移除左侧空白 """ """ S.lstrip([chars]) -> string or unicode Return a copy of the string S with leading whitespace removed. If chars is given and not None, remove characters in chars instead. If chars is unicode, S will be converted to unicode before stripping """ return "" def partition(self, sep): """ 分割,前,中,后三部分 """ """ S.partition(sep) -> (head, sep, tail) Search for the separator sep in S, and return the part before it, the separator itself, and the part after it. If the separator is not found, return S and two empty strings. """ pass def replace(self, old, new, count=None): """ 替换 """ """ S.replace(old, new[, count]) -> string Return a copy of string S with all occurrences of substring old replaced by new. If the optional argument count is given, only the first count occurrences are replaced. """ return "" def rfind(self, sub, start=None, end=None): """ S.rfind(sub [,start [,end]]) -> int Return the highest index in S where substring sub is found, such that sub is contained within S[start:end]. Optional arguments start and end are interpreted as in slice notation. Return -1 on failure. """ return 0 def rindex(self, sub, start=None, end=None): """ S.rindex(sub [,start [,end]]) -> int Like S.rfind() but raise ValueError when the substring is not found. """ return 0 def rjust(self, width, fillchar=None): """ S.rjust(width[, fillchar]) -> string Return S right-justified in a string of length width. Padding is done using the specified fill character (default is a space) """ return "" def rpartition(self, sep): """ S.rpartition(sep) -> (head, sep, tail) Search for the separator sep in S, starting at the end of S, and return the part before it, the separator itself, and the part after it. If the separator is not found, return two empty strings and S. """ pass def rsplit(self, sep=None, maxsplit=None): """ S.rsplit([sep [,maxsplit]]) -> list of strings Return a list of the words in the string S, using sep as the delimiter string, starting at the end of the string and working to the front. If maxsplit is given, at most maxsplit splits are done. If sep is not specified or is None, any whitespace string is a separator. """ return [] def rstrip(self, chars=None): """ S.rstrip([chars]) -> string or unicode Return a copy of the string S with trailing whitespace removed. If chars is given and not None, remove characters in chars instead. If chars is unicode, S will be converted to unicode before stripping """ return "" def split(self, sep=None, maxsplit=None): """ 分割, maxsplit最多分割几次 """ """ S.split([sep [,maxsplit]]) -> list of strings Return a list of the words in the string S, using sep as the delimiter string. If maxsplit is given, at most maxsplit splits are done. If sep is not specified or is None, any whitespace string is a separator and empty strings are removed from the result. """ return [] def splitlines(self, keepends=False): """ 根据换行分割 """ """ S.splitlines(keepends=False) -> list of strings Return a list of the lines in S, breaking at line boundaries. Line breaks are not included in the resulting list unless keepends is given and true. """ return [] def startswith(self, prefix, start=None, end=None): """ 是否起始 """ """ S.startswith(prefix[, start[, end]]) -> bool Return True if S starts with the specified prefix, False otherwise. With optional start, test S beginning at that position. With optional end, stop comparing S at that position. prefix can also be a tuple of strings to try. """ return False def strip(self, chars=None): """ 移除两段空白 """ """ S.strip([chars]) -> string or unicode Return a copy of the string S with leading and trailing whitespace removed. If chars is given and not None, remove characters in chars instead. If chars is unicode, S will be converted to unicode before stripping """ return "" def swapcase(self): """ 大写变小写,小写变大写 """ """ S.swapcase() -> string Return a copy of the string S with uppercase characters converted to lowercase and vice versa. """ return "" def title(self): """ S.title() -> string Return a titlecased version of S, i.e. words start with uppercase characters, all remaining cased characters have lowercase. """ return "" def translate(self, table, deletechars=None): """ 转换,需要先做一个对应表,最后一个表示删除字符集合 intab = "aeiou" outtab = "12345" trantab = maketrans(intab, outtab) str = "this is string example....wow!!!" print str.translate(trantab, 'xm') """ """ S.translate(table [,deletechars]) -> string Return a copy of the string S, where all characters occurring in the optional argument deletechars are removed, and the remaining characters have been mapped through the given translation table, which must be a string of length 256 or None. If the table argument is None, no translation is applied and the operation simply removes the characters in deletechars. """ return "" def upper(self): """ S.upper() -> string Return a copy of the string S converted to uppercase. """ return "" def zfill(self, width): """方法返回指定长度的字符串,原字符串右对齐,前面填充0。""" """ S.zfill(width) -> string Pad a numeric string S with zeros on the left, to fill a field of the specified width. The string S is never truncated. """ return "" def _formatter_field_name_split(self, *args, **kwargs): # real signature unknown pass def _formatter_parser(self, *args, **kwargs): # real signature unknown pass def __add__(self, y): """ x.__add__(y) <==> x+y """ pass def __contains__(self, y): """ x.__contains__(y) <==> y in x """ pass def __eq__(self, y): """ x.__eq__(y) <==> x==y """ pass def __format__(self, format_spec): """ S.__format__(format_spec) -> string Return a formatted version of S as described by format_spec. """ return "" def __getattribute__(self, name): """ x.__getattribute__('name') <==> x.name """ pass def __getitem__(self, y): """ x.__getitem__(y) <==> x[y] """ pass def __getnewargs__(self, *args, **kwargs): # real signature unknown pass def __getslice__(self, i, j): """ x.__getslice__(i, j) <==> x[i:j] Use of negative indices is not supported. """ pass def __ge__(self, y): """ x.__ge__(y) <==> x>=y """ pass def __gt__(self, y): """ x.__gt__(y) <==> x>y """ pass def __hash__(self): """ x.__hash__() <==> hash(x) """ pass def __init__(self, string=''): # known special case of str.__init__ """ str(object='') -> string Return a nice string representation of the object. If the argument is a string, the return value is the same object. # (copied from class doc) """ pass def __len__(self): """ x.__len__() <==> len(x) """ pass def __le__(self, y): """ x.__le__(y) <==> x<=y """ pass def __lt__(self, y): """ x.__lt__(y) <==> x<y """ pass def __mod__(self, y): """ x.__mod__(y) <==> x%y """ pass def __mul__(self, n): """ x.__mul__(n) <==> x*n """ pass @staticmethod # known case of __new__ def __new__(S, *more): """ T.__new__(S, ...) -> a new object with type S, a subtype of T """ pass def __ne__(self, y): """ x.__ne__(y) <==> x!=y """ pass def __repr__(self): """ x.__repr__() <==> repr(x) """ pass def __rmod__(self, y): """ x.__rmod__(y) <==> y%x """ pass def __rmul__(self, n): """ x.__rmul__(n) <==> n*x """ pass def __sizeof__(self): """ S.__sizeof__() -> size of S in memory, in bytes """ pass def __str__(self): """ x.__str__() <==> str(x) """ pass str
3.布尔值
True/False
4.列表:
name_list = ["a","b","s"]
索引
print name-list[0]
切片
name_list[0,2]
len
print name-list[2,name_lixnt.len()]
向后边追加:
append
name_list.append("d")
统计元素出现次数
count
name_list.count("d")
#iterable 可迭代的
扩展,相当于批量增加
extend
l = ["1","2"]
name_list.extend(l)
获取指定索引
index
name_list.index("a")
插入,指定索引位置插入
insert
name_list.insert(1,"sb")
去掉列表的最后一个。
pop
name_list.pop()
移除左边找到的第一个某个元素,
remove
name_list.remove("s")
反转列表
reverse
name_list.reverse()
删除指定索引号元素
del name_list[1]
del name_list[1:3]
列表排序
sort
name_list.sort()
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
class list(object): """ list() -> new empty list list(iterable) -> new list initialized from iterable's items """ def append(self, p_object): # real signature unknown; restored from __doc__ """ L.append(object) -- append object to end """ pass def count(self, value): # real signature unknown; restored from __doc__ """ L.count(value) -> integer -- return number of occurrences of value """ return 0 def extend(self, iterable): # real signature unknown; restored from __doc__ """ L.extend(iterable) -- extend list by appending elements from the iterable """ pass def index(self, value, start=None, stop=None): # real signature unknown; restored from __doc__ """ L.index(value, [start, [stop]]) -> integer -- return first index of value. Raises ValueError if the value is not present. """ return 0 def insert(self, index, p_object): # real signature unknown; restored from __doc__ """ L.insert(index, object) -- insert object before index """ pass def pop(self, index=None): # real signature unknown; restored from __doc__ """ L.pop([index]) -> item -- remove and return item at index (default last). Raises IndexError if list is empty or index is out of range. """ pass def remove(self, value): # real signature unknown; restored from __doc__ """ L.remove(value) -- remove first occurrence of value. Raises ValueError if the value is not present. """ pass def reverse(self): # real signature unknown; restored from __doc__ """ L.reverse() -- reverse *IN PLACE* """ pass def sort(self, cmp=None, key=None, reverse=False): # real signature unknown; restored from __doc__ """ L.sort(cmp=None, key=None, reverse=False) -- stable sort *IN PLACE*; cmp(x, y) -> -1, 0, 1 """ pass def __add__(self, y): # real signature unknown; restored from __doc__ """ x.__add__(y) <==> x+y """ pass def __contains__(self, y): # real signature unknown; restored from __doc__ """ x.__contains__(y) <==> y in x """ pass def __delitem__(self, y): # real signature unknown; restored from __doc__ """ x.__delitem__(y) <==> del x[y] """ pass def __delslice__(self, i, j): # real signature unknown; restored from __doc__ """ x.__delslice__(i, j) <==> del x[i:j] Use of negative indices is not supported. """ pass def __eq__(self, y): # real signature unknown; restored from __doc__ """ x.__eq__(y) <==> x==y """ pass def __getattribute__(self, name): # real signature unknown; restored from __doc__ """ x.__getattribute__('name') <==> x.name """ pass def __getitem__(self, y): # real signature unknown; restored from __doc__ """ x.__getitem__(y) <==> x[y] """ pass def __getslice__(self, i, j): # real signature unknown; restored from __doc__ """ x.__getslice__(i, j) <==> x[i:j] Use of negative indices is not supported. """ pass def __ge__(self, y): # real signature unknown; restored from __doc__ """ x.__ge__(y) <==> x>=y """ pass def __gt__(self, y): # real signature unknown; restored from __doc__ """ x.__gt__(y) <==> x>y """ pass def __iadd__(self, y): # real signature unknown; restored from __doc__ """ x.__iadd__(y) <==> x+=y """ pass def __imul__(self, y): # real signature unknown; restored from __doc__ """ x.__imul__(y) <==> x*=y """ pass def __init__(self, seq=()): # known special case of list.__init__ """ list() -> new empty list list(iterable) -> new list initialized from iterable's items # (copied from class doc) """ pass def __iter__(self): # real signature unknown; restored from __doc__ """ x.__iter__() <==> iter(x) """ pass def __len__(self): # real signature unknown; restored from __doc__ """ x.__len__() <==> len(x) """ pass def __le__(self, y): # real signature unknown; restored from __doc__ """ x.__le__(y) <==> x<=y """ pass def __lt__(self, y): # real signature unknown; restored from __doc__ """ x.__lt__(y) <==> x<y """ pass def __mul__(self, n): # real signature unknown; restored from __doc__ """ x.__mul__(n) <==> x*n """ pass @staticmethod # known case of __new__ def __new__(S, *more): # real signature unknown; restored from __doc__ """ T.__new__(S, ...) -> a new object with type S, a subtype of T """ pass def __ne__(self, y): # real signature unknown; restored from __doc__ """ x.__ne__(y) <==> x!=y """ pass def __repr__(self): # real signature unknown; restored from __doc__ """ x.__repr__() <==> repr(x) """ pass def __reversed__(self): # real signature unknown; restored from __doc__ """ L.__reversed__() -- return a reverse iterator over the list """ pass def __rmul__(self, n): # real signature unknown; restored from __doc__ """ x.__rmul__(n) <==> n*x """ pass def __setitem__(self, i, y): # real signature unknown; restored from __doc__ """ x.__setitem__(i, y) <==> x[i]=y """ pass def __setslice__(self, i, j, y): # real signature unknown; restored from __doc__ """ x.__setslice__(i, j, y) <==> x[i:j]=y Use of negative indices is not supported. """ pass def __sizeof__(self): # real signature unknown; restored from __doc__ """ L.__sizeof__() -- size of L in memory, in bytes """ pass __hash__ = None list
5.元组 tuple
元组很列表几乎一样,但是列表是可以修改的,元组是不能修改的。
name_tuple=("a","b")
索引
name_tuple[0]
len
print name_tuple(len(name_tuple)-1)
切片
print name_tuple[0:1]
for
for i in name_tuple:
获取元素的索引位置
name_tuple("a")
计算元素出现的个数
def count(self, value):
获取指定元素索引位置
def index(self, value, start=None, stop=None)
6.字典 dict
#字典的每个元素,键值对
user_info={
"name":"sb",
"age":42,
"gender":"man"
}
#索引
print user_info["name"]
循环
for i in user_info: #默认只输出key
print i
print user_info.key() #获取所有的key
print user_info.values() # 获取所有values
print user_info.items() #获取所有键值对
for k,v user_info.items():
print k,v
清除所有内容
clear
user_info.clear()
get 根据key获取值,如果key不存在,可以指定默认值
user_info.get("a",123)
def pop(self, k, d=None) 可以指定key
""" 获取并在字典中移除
user_info.pop("age")
def popitem(self): 由后往前
user_info.popitem()
print user_info
""" 获取并在字典中移除 """
更新字典:
update
test= {
"a"=1
"s"=2
}
user_info.update(test)
删除
del user_info("value")
7.enumrate
自动生成一列,默认0自增
enumrate
li = ["电脑","别墅","美女"]
for k,v in enumerate(li, 1):
print(k,v)
8.range和xrange
指定范围,生成指定的数字
print range(1, 10)
# 结果:[1, 2, 3, 4, 5, 6, 7, 8, 9]
print range(1, 10, 2)
# 结果:[1, 3, 5, 7, 9]
print range(30, 0, -2)
# 结果:[30, 28, 26, 24, 22, 20, 18, 16, 14, 12, 10, 8, 6, 4, 2]
# 三元运算
# name = 值1 if 条件 esle 值2
if 1==1:
name="alxe"
else:
name="eric"
#三元运算
name = "alxe" if 1==1 else "eric"
print(name)
# 如果条件成立,那么将 “值1” 赋值给result变量,否则,将“值2”赋值给result变量
#深浅拷贝
# 1.对于 数字 和 字符串 而言,赋值、浅拷贝和深拷贝无意义,因为其永远指向同一个内存地址。
import copy
n1 = 123
# ## 浅拷贝 ##
n2 = copy.copy(n1)
print(id(n2))
# ## 深拷贝 ##
n3 = copy.deepcopy(n1)
print(id(n3))
# # 对于字典、元祖、列表 而言,进行赋值、浅拷贝和深拷贝时,其内存地址的变化是不同的。
#
# 1、赋值
#
# 赋值,只是创建一个变量,该变量指向原来内存地址
# 2、浅拷贝
# 浅拷贝,在内存中只额外创建第一层数据
# 3、深拷贝
#
# 深拷贝,在内存中将所有的数据重新创建一份(排除最后一层,即:python内部对字符串和数字的优化)