The startswith () function and endswith () function determine the beginning and end of the file

There are two functions in Python, namely startswith () function and endswith () function, which are very similar in function. The startswith () function determines whether the text starts with a certain character, and the endswith () function determines whether the text ends with a certain character.

startswith () function

This function determines whether a text starts with a character or characters, and the result is returned as True or False.

code show as below:

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 () function

This function determines whether a text ends with one or more characters, and the result is returned as True or False.

code show as below:

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

Determine whether the file is an exe executable file

We can use the endswith () function to determine whether the file name ends with an .exe suffix to determine whether it is an executable file

Copy the code The code is as follows:

# coding = utf8
 
fileName1 = 'qttc.exe'
if (fileName1.endswith ('. exe')):
    print 'this is an exe execution file'  
else:
    print 'this is not an exe execution file'
 
# execution result: this is An exe execution file

Determine whether the file name suffix is ​​a picture

code show as below:

# coding = utf8
 
fileName1 = 'pic.jpg'
if fileName1.endswith ('. gif') or fileName1.endswith ('. jpg') or fileName1.endswith ('. png'):
    print 'This is a picture'
else:
    print 'This is not a picture'
    
# Execution result: this is a picture