内置方法练习(一)

字符串内置方法练习

# 字符串长度
name = 'his name is tom'
print(len(name))

#字符串索引取值
print(name[6])

#字符串切片练习
print(name[1:7:3]) # 顾头不顾尾，步长取的值也包括在步长内 
print(name[::-1]) # 字符串翻转
print(name[:-1]) # 取最后一个值前面所有值
print(name[1:]) # 取第一个值后面所有值
print(name[-3:]) # 逆序取值

ia
motsiemansih
hisnameisto
isnameistom
tom

# 字符串成员运算
print('tom' in name) # tom在name中
print('tom' not in name) # tom不在name中
print(name)

True
False
his name is tom

# 字符串移除空白（只能移除左右空白）
name = '*** his name is jack  ***'
print(name.strip())  # 默认移除空格 空格优先级最高 同等情况下 添加的参数优先级不如空格 可以添加参数 如下
print(name.strip('*'))  # 切除两边指定的数值
print(name.lstrip('*')) # 切除左边指定的数
print(name.rstrip('*')) # 切除右边值定的数

*** his name is jack  ***
 his name is jack  
 his name is jack  ***
*** his name is jack

# 字符串切分
name_list = 'tom,jack,ellie'
print(name_list.split(',')) # 切分指定的参数成为列表
print(name_list.split(',',1)) # 切分指定的几个数成为列表
print(name.rsplit(' ',1))  # 切分字符串 从右边开始

['tom', 'jack', 'ellie']
['tom', 'jack,ellie']
['His name is', 'Tom']

# 字符串循环
name = 'his name is tom'
for i in name:
    print(i)

h
i
s
 
n
a
m
e
 
i
s
 
t
o
m

# 字符串大小写转换
name = 'His name is Tom,His name is Tom'
print(name.lower())  # 字符串全部转化为小写
print(name.upper()) # 字符串全部转化为大写

his name is tom,his name is tom
HIS NAME IS TOM,HIS NAME IS TOM

# 判断字符串是以什么开头或者以什么结尾
print(name.startswith('His')) # 判断字符串是否以His开头
print(name.endswith('tom')) # 判断字符串是否以tom结尾

True
False

# 字符串的替换
print(name.replace('Tom','Jack')) # 替换默认为全部替换，可以添加参数 参数为替换的次数 如下
print(name.replace('Tom','Jack',1))

His name is Jack,His name is Jack
His name is Jack,His name is Tom

# 以指定的字符分割列表
info_list = ['tom','18','sex']
print(':'.join(info_list))

tom:18:sex

# 判断字符串是否为整数
number = '123'
number_f = '123.7'
print(number.isdigit())
print(number_f.isdigit())

True
False

列表内置方法练习

name_list = ['tom','jack','ellie','chris']
# 索引取值
print(name_list[3])

chris

# 切片
print(name_list[0:])
print(name_list[::-1])
print(name_list[0:3:2])

['tom', 'jack', 'ellie', 'chris']
['chris', 'ellie', 'jack', 'tom']
['tom', 'ellie']

# len
print(len(name_list))

# 成员运算
print('ellie' in name_list)
print('ellie'not in name_list)

True
False

#追加值
name_list.append('kuck')
print(name_list)

['ellie', 'chris', 'kuck', 'kuck']

# 删除 
del name_list[3]
print(name_list)

['tom', 'jack', 'ellie']

# 循环
for i in name_list:
    print(i)

tom
jack
ellie

# 插入
name_list.insert(0,'Alan')  # 0表示要插入的位置
print(name_list)

['Alan', 'tom', 'chris', 'jack', 'ellie']

# 移除
# name_list.pop(0) # 默认移除最后一个元素 索引移除
name_list.remove('ellie')  # 直接移除元素 value
print(name_list)

['tom', 'jack']

# count统计元素出现的次数
print(name_list.count('jack'))
print(name_list)

3
['tom', 'jack', 'Alan', 'jack', 'chris', 'kuck', 'jack']

# 获取索引值
print(name_list.index('tom'))

#清除列表
hobby = ['sing','dance','ran']
print(hobby.clear())

None

#列表复制
name_list_c = name_list.copy()
print(name_list_c)

['tom', 'jack', 'Alan', 'jack', 'chris', 'kuck', 'jack']

#列表拼接
name_list.extend(name_list_c)
print(name_list)

['tom', 'jack', 'Alan', 'jack', 'chris', 'kuck', 'jack', 'tom', 'jack', 'Alan', 'jack', 'chris', 'kuck', 'jack']

#列表反转
print(name_list.reverse())

None

# 排序
name_list = ['tom','jack','ellie']
print(name_list.sort())

None