python字符串操作

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Auther: Summer

# 字符串操作
name = "summer Du"
print(name.capitalize())  # 首字母变大写
print(name.casefold())  # 大写字母全部变小写
print(name.center(50,"="))  # 输出====================summer Du=====================
print(name.count("m"))  # 统计m出现次数
print(name.encode())  # 将字符串编码成bytes格式
print(name.endswith("m"))  # 判断字符串是否以m结尾
print(name.find("D"))  # 查找D，找到返回其索引值，找不到返回-1，返回其找到第一的索引值

name = "sum\tmer Du"
print(name.expandtabs(10))  # 输出sum       mer Du

# format
msg = "my name is {},and age is {}"
print(msg.format("summer","24"))
msg = "my name is {1},and age is {0}"
print(msg.format("summer","22"))
msg = "my name is {name},and age is {age}"
print(msg.format(name = "summer",age = "22"))
print(msg.format(age = "22",name = "summer"))

# format_map
print(msg.format_map({'age': 22,'name': "summer"}))
msg = "my name is {name},and age is {age}"
print(msg.index("m"))

print("9Aa".isalnum())
print("9".isdigit())   # 是否整数
print(name.isnumeric())
print(name.isprintable())
print(name.isspace())
print(name.istitle())
print(name.isupper())
name = "summer Du"
print(name.join("lee"))
print("|".join(["lee","summer"]))  # 放到列表里

# maketrans  Python maketrans() 方法用于创建字符映射的转换表，
# 对于接受两个参数的最简单的调用方式，第一个参数是字符串，表示需要转换的字符，
# 第二个参数也是字符串表示转换的目标。
intab = "aeiou"
outtab = "12345"
trantab =str.maketrans(intab,outtab)
print(trantab)

# partition
print(msg.partition("is"))

r = "my name is summer,and age is 22"
print(r.replace("m","n",2))

print(name.swapcase())   # 大小写互换

print(msg.zfill(40))
print(msg.ljust(40,"-"))
print(msg.rjust(50,"="))
print(msg.center(50,"="))

b = " ddefs;ajfdal;_hahO(∩_∩)O哈哈~"
c = "dd_哈哈"
print(b.isidentifier())  ##检测一段字符串可否被当作标志符，即是否符合变量命名规则
print(c.isidentifier())  ##检测一段字符串可否被当作标志符，即是否符合变量命名规则