Python string number sorting: How to efficiently sort strings containing Chinese and Arabic numerals?

Python string number sorting: cleverly deal with mixed Chinese and English numbers sorting

In Python programming, sorting strings containing Chinese and Arabic numerals is a common challenge. This article will provide an efficient solution and demonstrate through examples how to implement custom sorting.

Suppose we have a list of strings containing Chinese and Arabic numerals:

 data = [
    ('Test text', 'Season 2 Episode 2'),
    ('Test text', 'Season 1 Episode 1'),
    ('Test text', 'Season 1 Episode 2'),
    ('Test text', 'Season 2 Episode 1'),
]

Our goal is to sort the x and y values ​​of "Season x Episode y" in the string, with the expected results as follows:

 data = [
    ('Test text', 'Season 1 Episode 1'),
    ('Test text', 'Season 1 Episode 2'),
    ('Test text', 'Season 2 Episode 1'),
    ('Test text', 'Season 2 Episode 2')
]

To do this, we will combine Python's regular expressions and dictionaries to accomplish this task. First, create a dictionary to map Chinese numbers to Arabic numerals:

 cn_to_num = {
    'One': 1,
    'two': 2,
    'Three': 3,
    'Four': 4,
    'Five': 5,
}

Then, use the regular expression re.compile(r'第(.*)季第(.*)集') to extract the number of seasons and episodes in the string. Use the cn_to_num dictionary to convert Chinese numbers into Arabic numbers and sort them.

The complete code is as follows:

 import re

cn_to_num = {
    'One': 1,
    'two': 2,
    'Three': 3,
    'Four': 4,
    'Five': 5,
}

data = [
    ('Test text', 'Season 2 Episode 2'),
    ('Test text', 'Season 1 Episode 1'),
    ('Test text', 'Season 1 Episode 2'),
    ('Test text', 'Season 2 Episode 1'),
]

def sort_key(item):
    match = re.match(r'Season (.*)Episode (.*)', item[1])
    If match:
        season, episode = match.groups()
        season_num = cn_to_num.get(season, int(season))
        episode_num = cn_to_num.get(episode, int(episode))
        return season_num * 10 episode_num
    return float('inf') # Handle cases without matching pattern

sorted_data = sorted(data, key=sort_key)
print(sorted_data)

This code defines a sort_key function that uses regular expressions to extract the number of seasons and sets and converts them according to the cn_to_num dictionary. The sorted function uses sort_key as the sort key to sort the list. The code also considers the special case where the regular expression is not matched, putting it at the end. In this way, we can efficiently sort strings containing Chinese and Arabic numerals.

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