常用数据编辑1

#查看
print(df.head(2))
print(df.tail())
# .head()查看头部数据
# .tail()查看尾部数据
# 默认查看5条

print(df.T)# .T 转置

# 新增列/行并赋值
df['e'] = 10
df.loc[4] = 20
print(df)

# 索引后直接修改值
df['e'] = 20
df[['a','c']] = 100
print(df)

#删除
del df['a']
print(df.drop(['d'], axis = 1))
print(df.drop(0))
print(df.drop([1,2]))
print(df.drop(['d'], axis = 1))