python
# str1="duoceshi"# print(str1)
# print(str1)
# print(str1)
# print(str1)
# print(str1[-1])
# print(str1[-5])
# print(str1[-9])
# str1 = "duoceshi"
# print(str1)duoce
# print(str1) uoces
# print(str1) oc
# print(str1[-6:-2]) oces
# print(str1)取值为空
# print(str1[:5]) duoce
# print(str1)ceshi
# print(str1[:]) duoceshi
# str1 = "duoceshi"
# print(str1) hseco
# print(str1[-2:-6:-1])hsec
# print(str1)取值为空
# print(str1[:-4:-1])ihs
# print(str1[-2::-1]) hsecoud
# print(str1) c
# print(str1[::-1]) ihsecoud
# str1="duoceshi"
# print(str1)doe
# print(str1[-1:-7:-2])isc
# str1="duoceshi"
# print(str1[:])duoceshi
# print(str1[::-1]) ihsecoud
# 给你一串字符，怎样取处追后元素
# str1="duoceshi"
# print(str1)hi
# print(str1[-2:])hi
# str1="xiao zhang"
# print(str1.capitalize())Xiao zhang
# print(str1.title()) Xiao Zhang
# print(str1.count("a")) 2
# print(str1.count("z"))1
# str1="xiaozhang"
# print("-".join(str1)x-i-a-o-z-h-a-n-g
# print("@".join(str1)x@i@a@o@z@h@a@n@g
# str1="xiao zhang"
# print(str1.split(" ")) ['xiao', 'zhang']
# print(type(str1))<class 'str'>
# print(type(str1.split(" ")))<class 'list'>
# list1=str1.split(" ")
# print(list1)
# print(list1)
# print(list1)
# print(list1) IndexError: list index out of range
# split()
# 把字符串str1="user_name" 输出成UserName
# str1="user_name"
# list1=str1.title().split("_")
# print(list1)['User', 'Name']
# print(list1 + list1 UserName
# print("". join(list1)) UserName
# str1="duoceshidu"
# print(str1.strip("du"))oceshi
# print(str1.strip("ud"))oceshi
# print(str1.strip("o"))duoceshidu
# str1="duoceshiud"
# print(str1.lstrip("d")) uoceshioud
# print(str1.lstrip("du")) oceshiud
# print(str1.lstrip("ud")) oceshiud
# print(str1.lstrip("o")) duoceshiud
str1="duoceshiud"
# print(str1.rstrip("d")duoceshiu
# print(str1.rstrip("du")) duoceshi
print(str1.rstrip("u")) duoceshiud
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