SoFunction
Updated on 2025-04-11

Detailed explanation of Python string manipulation strip and split methods

Preface

In Python programming,strip()andsplit()are two very commonly used string operation methods that can help us easily process and manipulate string data. Understanding how they work allows us to complete tasks more efficiently while cleaning data and text processing. This article will introduce the usage scenarios and typical usages of these two methods in detail.

1. Strip() method

1. What is strip()?

strip()It is a method in the Python string class, which is used to remove whitespace characters at the beginning and end of a string (including spaces and tab characters)\t, line break\nwait). In addition, it can also be used to delete specified characters.

2. Basic syntax

([chars])
  • chars: Optional parameter indicating the set of characters to be removed. If not specified, whitespace characters are removed by default.

3. Basic usage examples

1) Remove whitespace characters

The most common usage is to delete whitespace characters at both ends of a string:

text = "  Hello, World!  "
cleaned_text = ()
print(cleaned_text)  # Output: 'Hello, World!'

In this example,strip()Remove spaces on both sides of the string.

2) Remove the specified character

You can also specify the character set to be removed:

text = "***Hello, World!!!***"
cleaned_text = ('*!')
print(cleaned_text)  # Output: 'Hello, World'

In this example,strip('*!')Removed all the beginning and end of the string*and!Symbol.

4. lstrip() and rstrip()

  • lstrip()Only characters to the left of the string will be removed.
  • rstrip()Only characters to the right of the string will be removed.
text = "  Hello, World!  "
print(())  # Output: 'Hello, World! 'print(())  # Output: ' Hello, World!'

These methods can accurately operate on the left and right sides of the string according to requirements.

5. Things to note

  • strip()Only characters at both ends will be deleted, and characters in the middle of the string will not be deleted.
  • If you specify a character set,strip()These characters will be deletedAny oneThe part that appears at both ends, not the exact sequence in the string.

2. Split() method

1. What is split()?

split()Method is used to split a string into a list according to the specified delimiter. It is usually used to parse string data into multiple parts for easy subsequent processing.

2. Basic syntax

(sep=None, maxsplit=-1)
  • sep: Optional parameter, specify the separator. If not specified orNone, whitespace characters (including spaces, newlines, tabs) are used as the default delimiter.
  • maxsplit: Optional parameter, indicating the maximum number of splits. If not specified or is -1, all occurrences of delimiters are split.

3. Basic usage examples

1) Split string by space

text = "Hello, how are you?"
words = ()
print(words)  # Output: ['Hello,', 'how', 'are', 'you?']

Here,split()Split the string into multiple words according to spaces.

2) Specify the separator

text = "apple,banana,orange"
fruits = (',')
print(fruits)  # Output: ['apple', 'banana', 'orange']

In this example,split(',')Split the string into multiple fruit names via commas.

3) Limit the number of splits

You can passmaxsplitParameters to limit the number of splits. For example, if you want to split only once:

text = "name: John, age: 30, city: New York"
parts = (', ', 1)
print(parts)  # Output: ['name: John', 'age: 30, city: New York']

In this example,split(', ', 1)Only the first split was performed, and the remaining part was kept as a string.

4. rsplit() method

andsplit()Similar, butrsplit()Start splitting from the right side of the string. It is usually used to want to intercept a part from the right.

text = "apple,banana,orange"
fruits = (',', 1)
print(fruits)  # Output: ['apple,banana', 'orange']

here,rsplit(',', 1)Start splitting from the right and limit splitting once.

5. splitlines() method

splitlines()is another commonly used string segmentation method, which can split strings by line breaks.

text = "Hello\nWorld\nPython"
lines = ()
print(lines)  # Output: ['Hello', 'World', 'Python']

This method is very suitable for handling multi-line string data.

3. The combination of strip() and split()

strip()andsplit()It is often used in combination, especially when dealing with strings containing extra whitespace or special characters.

1) Remove the space and then split

text = "   apple, banana, orange   "
cleaned_text = ()
fruits = cleaned_text.split(', ')
print(fruits)  # Output: ['apple', 'banana', 'orange']

In this example, usestrip()Delete extra spaces on both sides of the string and usesplit(', ')Split it into a list of fruit names.

2) Process data with newline characters

data = "  John Doe\n  30\n  New York\n"
lines = ().splitlines()
print(lines)  # Output: ['John Doe', '30', 'New York']

Pass here firststrip()Remove the blank characters at both ends and usesplitlines()Split the string by line.

4. Summary

  • strip()Mainly used to remove blanks or specified characters at both ends of strings.
  • split()Used to split a string into multiple parts and return a list. It is perfect for parsing data.
  • Their combined use can greatly simplify the process of data cleaning.

Whether it is processing simple strings or complex text data,strip()andsplit()They are all very practical tools. Mastering their usage can help you write more concise and efficient Python code.

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