Python removes the specified characters in the string [easy to understand]

Hello everyone , I meet you again , I'm your friend, Quan Jun .

python Medium strip() You can remove the specified characters at the beginning and end

ss = ' My phone number is 18827038663, It's also a micro signal ,\n Please join , thank you \n\n\n'
print(ss.strip('\n'))

result ：

 My phone number is 18827038663, It's also a micro signal ,
Please join , thank you 

You can see that only the specified characters at the beginning and end can be deleted .

Want to remove the middle character , have access to replace() function

ss = ' My phone number is 18827038663, It's also a micro signal ,\n Please join , thank you \n\n\n'
print(ss.replace('\n', ''))

result ：

 My phone number is 18827038663, It's also a micro signal , Please join , thank you 

note:

1. strip(str)

Basic usage ：ss.strip(rmStr)

ss.strip() When the parameter is empty , Default removal ss The beginning and end of the string \r, \t, \n, Spaces and other characters ; When the parameter is a certain character , You can remove the specified characters at the beginning and end , for example ：

Input ：

ss = ' My phone number is 18827038663, It's also a micro signal , Please join , Thank you, Lala '
print(ss.strip(' Yeah '))

Running results ：

 My phone number is 18827038663, It's also a micro signal , Please join , thank you 

We need to pay attention to strip Is in accordance with the Character level Matching , As long as the head and tail appear Characters in the character set , Will be strip fall , Instead of matching the whole character .

ss.lstrip() Delete ss The specified character at the beginning of the string ,ss.rstrip() Delete ss The specified character at the end

2. replace(old, new[, max])

Basic usage ：ss.replace(old, new[, max])

old Is the character in the original string ,new Is a new string that needs to be replaced with ,max Is the maximum number of matches , Match from left to right at most max Time . In general, it is not set max Value , Replace all by default .

Input ：

ss = 'old old string'
ret = ss.replace('old', 'new', 1)
print(ret)

Output ：

new old string

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