Home Backend Development Python Tutorial Python中的startswith和endswith函数使用实例

Python中的startswith和endswith函数使用实例

Jun 06, 2016 am 11:32 AM
python

在Python中有两个函数分别是startswith()函数与endswith()函数,功能都十分相似,startswith()函数判断文本是否以某个字符开始,endswith()函数判断文本是否以某个字符结束。

startswith()函数

此函数判断一个文本是否以某个或几个字符开始,结果以True或者False返回。

代码如下:


text='welcome to qttc blog'
print text.startswith('w')      # True
print text.startswith('wel')    # True
print text.startswith('c')      # False
print text.startswith('')       # True

endswith()函数

此函数判断一个文本是否以某个或几个字符结束,结果以True或者False返回。

代码如下:


text='welcome to qttc blog'
print text.endswith('g')        # True
print text.endswith('go')       # False
print text.endswith('og')       # True
print text.endswith('')         # True
print text.endswith('g ')       # False

判断文件是否为exe执行文件

我们可以利用endswith()函数判断文件名的是不是以.exe后缀结尾判断是否为可执行文件

代码如下:


# coding=utf8
 
fileName1='qttc.exe'
if(fileName1.endswith('.exe')):
    print '这是一个exe执行文件'  
else:
    print '这不是一个exe执行文件'
 
# 执行结果:这是一个exe执行文件

判断文件名后缀是否为图片

代码如下:


# coding=utf8
 
fileName1='pic.jpg'
if fileName1.endswith('.gif') or fileName1.endswith('.jpg') or fileName1.endswith('.png'):
    print '这是一张图片'
else:
    print '这不是一张图片'
    
# 执行结果:这是一张图片

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