python string

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本文详细介绍了Python中字符串的各种操作方法，包括单双引号使用、转义字符处理、多行字符串输出、字符串连接与索引切片等核心概念。通过实际代码示例，帮助读者更好地理解和掌握Python字符串的基础用法。

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一、封闭在单引号或双引号里

print('spam eggs')
print('doesn\'t')# use \' to escape the single quote 
print("doesn't")# ...or use double quotes instead
print('"Yes," he said.')
print( "\"Yes,\" he said.")
print('"Isn\'t," she said.')
print('"Isn\"t," she said.')

spam eggs
doesn't
doesn't
"Yes," he said.
"Yes," he said.
"Isn't," she said.
"Isn"t," she said.

二、处理\n引起的换行

print('C:\some\name')
print('C:\some\\name')
print(r'C:\some\name')

C:\some
ame
C:\some\name
C:\some\name

三、占据多行的string，如何输出

print("""\
Usage: thingy [OPTIONS]
     -h                        Display this usage message
     -H hostname               Hostname to connect to
""")#单引号'''...... '''，双引号都行""".......""" ， \是一行写不下的时候，连接这一行与下一行

Usage: thingy [OPTIONS]
-h Display this usage message
-H hostname Hostname to connect to

四、string的连接

print('py' 'thon' '11')#这种只能是常量的连接
print('ab', 'cd')#这种不是连接
print(3*'un' + 'ium')
print(3*'un' 'ium')
print(3*'un', 'ium')

prefix = 'py'
print(prefix + 'ttt')#变量与常量的连接，只能这种

text = ('Put several strings within parentheses '
            'to have them joined together.')
print(text)

python11
ab cd
unununium
uniumuniumunium
ununun ium
pyttt
Put several strings within parentheses to have them joined together.

五、string的索引与切片

word = 'Python'
print(word[0])
print(word[-3])
print(word[:2])
#word[42] 越界，出错
print(word[4:42])
print(word[42:])#空字符串，即 ''
'''word[0] = 'J'
word[2:] = 'py' 
TypeError: 'str' object does not support item assignment
'''

P
h
Py
on