# _Author:huang# date: 2017/11/28

# 字符串

'''print("hello" * 3)print("hello world"[2:])

print("llo" in "hello world")

print(123 in [1232,123,345])

print("Huang is a good teacher")print("%s is a good teacher" % "Huang")

a = "123"b = "456"c = a+bprint(c)

d = ''.join([a, b])    #  拼接print(d)'''

# str内置方法'''st = 'hello kitty {name} is {age}'st1 = 'he\tllo kitty'print(st.count('t'))  # 统计元素个数print(st.capitalize())    #  首字母大写print(st.center(50, '-'))   #  一共打印50个字符，并且字符串放中间print(st.endswith('it'))  # 判定以某个字符串结尾print(st.startswith("h")) #   判定以某个字符串开头print(st.startswith("hel")) #   判定以某个字符串开头print(st1.expandtabs(tabsize=10)) #间隔10个字符print(st.find('t'))  #  查找到第一个元素，并将第一个索引值返回print(st.format(name='huang',age = 30)) #  赋值，可以自动选定{}print(st.format_map({'name':'huang', 'age':20}))

print(st.index('e'))print(st.isalnum()) #判定字符串是否是数字print('56566'.isalnum()) #判定字符串是否是数字print('dewf'.isalpha()) #判定字符串是否是字母

print('323'.isdigit()) #判定字符串是否是整数数字print('2134'.isdigit())print('34abb'.isidentifier())#判定字符串是否是以非法开头print('Abc'.islower())print('ctAD'.isupper())print(' uu'.isspace())print('My name'.istitle()) #每个单词的手写字母大写print('My Title'.lower()) #大写变小写print('Mhfrue'.upper()) #小写变大写print('fhieHIOhgdwi'.swapcase()) #大小写互换print('My teig'.ljust(50,'*')) # 字符在左侧print('ciwbre'.rjust(23,'*')) # 字符在右边print("cbniv\n")print('My title\n  '.strip()) # 去掉换行符print('oh')

print('\tvnd\n'.replace('v', 'a')) #替换print("name".replace('name','life'))print('name name name'.replace('name', 'life',2))print('lame name'.rfind('a'))print('My title title'.split(' '))  #  字符串变为列表print('My title title'.split('i'))  #  字符串变为列表print('my title title'.rsplit('i', 1)) #只分隔一次，从右往左print("my name".title()) #按照标题修改字符串'''

#  重要的字符串方法'''print(st.count('l'))st.startswith('nfi')st.find('fre')st.center(30,'%')st.format()st.lower()st.upper()st.strip()st.replace()st.split()'''