python字符串string的内置方法

#__author: "Pizer Wang"
#__date: 2018/1/28

a = "Let's go"
print(a)
print("-------------------")

a = 'Let\'s go'
print(a)
print("-------------------")

print("hello" * 3)
print("helloworld"[2:])
print("-------------------")

print("ell" in "helloworld")
print("-------------------")

print("Pizer is a good student")
print("%s is a goog student" % "Pizer")
print("-------------------")

a = "1234"
b = "abcd"
c = "!@#$"
d = a + b + c
print(d)

d = "".join([a, b, c])
print(d)
d = ", ".join([a, b, c])
print(d)
d = "++".join([a, b, c])
print(d)
print("-------------------")

print("string的内置方法")
str = "helloworld"
print(str.count("l"))           #统计元个数
print(str.capitalize())         #首字母大写
print(str.center(25, "-"))      #居中
print(str.endswith("d"))
print(str.endswith("world"))
print(str.endswith("word"))     #是否以某个内容结尾
print(str.startswith("hello"))  #是否以某个内容开始
str = "hello\tworld"
print(str.expandtabs(tabsize=10))
print("-------------------")
str = "helloworld {name} is {age}"
print(str.find("w"))            #查找到第一个元素并将索引值返回
print(str.format(name = "Pizer", age = 18))
print(str.format_map({"name":"Jone", "age":25}))
print("-------------------")
print(str.index("w"))
#print(str.index("www"))        #报错
print(str.find("wwww"))
print("-------------------")

str = "123abc"
print(str.isalnum())
str = "123"
print(str.isalnum())
str = "abc"
print(str.isalnum())
str = "!@$"
print(str.isalnum())
str = "中国万岁"
print(str.isalnum())
print("-------------------")

print("123456".isdecimal())
print("123456ff".isdecimal())
print("123456789".isdigit())
print("12345.6789".isdigit())
print("12345.6789".isnumeric())
print("-------------------")

print("34abc".isidentifier())
print("_34abc".isidentifier())
print("abc".islower())
print("abC".islower())
print("ABC".isupper())
print(" ".isspace())
print("-------------------")

print("Hello Jone".istitle())
print("Good morning".istitle())
print("-------------------")

print("Hello Jone".lower())
print("Good morning".upper())
print("Hello Jone".swapcase())
print("-------------------")

print("Hello world".ljust(20, "-"))
print("Hello world".rjust(20, "-"))
print("    Hello world  \t   \n")
print("    Hello world   ".strip())
print("    Hello world   ".lstrip())
print("    Hello world   ".rstrip())
print("-------------------")

print("Hello Jone Jone".replace("Jone", "Pizer"))
print("Hello Jone Jone".replace("Jone", "Pizer", 1))
print("My title".find("t"))
print("My title".rfind("t"))
print("-------------------")

print("Hello world".split(" "))
print("Hello world".split("l", 1))
print("Hello world".rsplit("l", 1))
print("hello jone".title())
print("-------------------")

#重要的字符串方法
# print(st.count('l'))
# print(st.center(50,'#'))   #  居中
# print(st.startswith('he')) #  判断是否以某个内容开头
# print(st.find('t'))
# print(st.format(name='alex',age=37))  # 格式化输出的另一种方式   待定：?:{}
# print('My tLtle'.lower())
# print('My tLtle'.upper())
# print('\tMy tLtle\n'.strip())
# print('My title title'.replace('itle','lesson',1))
# print('My title title'.split('i',1))

执行结果:

Let’s go

Let’s go

hellohellohello

lloworld

True

Pizer is a good student

Pizer is a goog student

1234abcd!@#1234abcd!@#1234abcd!@#

1234, abcd, !@#$

1234++abcd++!@#$

string的内置方法

3

Helloworld

——–helloworld——-

True

True

False

True

hello world

5

helloworld Pizer is 18

helloworld Jone is 25

5

-1

True

True

True

False

True

True

False

True

False

False

False

True

True

False

True

True

True

False

hello jone

GOOD MORNING

hELLO jONE

Hello world———

———Hello world

Hello world

Hello world

Hello world

Hello world

Hello Pizer Pizer

Hello Pizer Jone

3

5

[‘Hello’, ‘world’]

[‘He’, ‘lo world’]

[‘Hello wor’, ‘d’]

Hello Jone