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python字符串连接方式汇总

Jun 16, 2016 am 08:42 AM
python string Summary connect

在python中有很多字符串连接方式,今天就在这里具体总结一下:

①.最原始的字符串连接方式:str1 + str2
②.python 新字符串连接语法:str1, str2
③.奇怪的字符串方式:str1 str2
④.% 连接字符串:‘name:%s; sex: ' % ('tom', 'male')
⑤.字符串列表连接:str.join(some_list)

下面具体分析一下:

第一种,想必只要是有编程经验的人,估计都知道,直接用 “+” 来连接两个字符串:

'Jim' + 'Green' = 'JimGreen'

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第二种比较特殊,如果两个字符串用“逗号”隔开,那么这两个字符串将被连接,但是,字符串之间会多出一个空格:

'Jim', 'Green' = 'Jim Green'
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第三种也是 python 独有的,只要把两个字符串放在一起,中间有空白或者没有空白:两个字符串自动连接为一个字符串:

'Jim''Green' = 'JimGreen'
'Jim' 'Green' = 'JimGreen'
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第四种功能比较强大,借鉴了C语言中 printf 函数的功能,如果你有C语言基础,看下文档就知道了。这种方式用符号“%”连接一个字符串和一组变量,字符串中的特殊标记会被自动用右边变量组中的变量替换:

'%s, %s' % ('Jim', 'Green') = 'Jim, Green'

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第五种就属于技巧了,利用字符串的函数 join 。这个函数接受一个列表,然后用字符串依次连接列表中每一个元素:

var_list = ['tom', 'david', 'john']
a = '###'
a.join(var_list) = 'tom###david###john'

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其实,python 中还有一种字符串连接方式,不过用的不多,就是字符串乘法,如:

a = 'abc'
a * 3 = 'abcabcabc'

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希望本文所述示例对大家的Python程序设计能有一定的帮助。

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