用于在所需数组元素中插入空格的Python字符串修复

Question

我有下面的代码。基本上，我想把像"appleBanana"，"bananaFruit"，"cherryBlossom“这样的数组转换成”苹果香蕉“，”香蕉果“，”樱花“。

这是用Python编写的。

可重现的例子：

typelist = ["appleBanana", "bananaFruit", "cherryBlossom"]
  

typelist2 = ['']
last_was_upper = True

counter = 0

for d in typelist:
    for c in d:
        if c.isupper():
            if not last_was_upper:
                typelist2[counter] += ' '
            last_was_upper = True
        else:
          last_was_upper = False
          
        typelist2[counter] += c 
        
    counter = counter + 1
      
  
 


print(typelist2)

编辑

对于我的实际代码，这是我得到的输出

[' Advanced Algebra', ' Problem Solvingand Data Analysis', ' Basic Algebra', ' Problem Solvingand Data Analysis', ' Advanced Algebra', ' Advanced Algebra', ' Advanced Algebra', ' Problem Solvingand Data Analysis', ' Advanced Algebra', ' Problem Solvingand Data Analysis', ' Problem Solvingand Data Analysis', ' Problem Solvingand Data Analysis', ' Advanced Algebra', ' Problem Solvingand Data Analysis', ' Advanced Algebra', ' Advanced Algebra', ' Advanced Algebra', ' Advanced Algebra', ' Advanced Algebra', ' Problem Solvingand Data Analysis']

注意他们中的一些人在短语前有一个空格，而另一些人在字母之间没有空格。我想要的结果是简单的“高级代数”(显然有各自的字段)。如何删除开头的空格，并在中间为所有空格添加空格？

Answer 1

您可以在一行解决方案中使用简单的列表理解来实现输出：

import re
typelist=["appleBanana", "bananaFruit", "cherryBlossom"]
typelist2=[re.sub(r"(\w)([A-Z])", r"\1 \2", element).title() for element in typelist]

输出：

>>> typelist2
['Apple Banana', 'Banana Fruit', 'Cherry Blossom']

re模块包含在标准的python发行版中，需要在大写字母前插入一个空格。

调用title()方法将第一个字母大写。

Answer 2

这里有一个没有正则表达式的解决方案(它没有问题，只是采用了不同的方法)：

typelist = ["appleBanana", "bananaFruit", "cherryBlossom"]

# for word in typelist
#   for letter in word:
#       if letter is uppercase, split word by index of letter,
#       then uppercase the first letter and put a space between the two words.

fixed_typelist = []
for word in typelist:
    for index, letter in enumerate(word):
        if letter.isupper():
            split_letter = word[:index].title(), word[index:]
            fixed_word = ' '.join(split_letter)
            fixed_typelist.append(fixed_word)

print(fixed_typelist)
>>> ['Apple Banana', 'Banana Fruit', 'Cherry Blossom']

本质上，核心问题是识别大写字母的索引(或位置)。我选择通过enumerate来实现这一点，它返回字母索引和字母本身的迭代量。找到索引后，您只需将单词拆分，并将第一个单词的第一个字母大写。

Answer 3

另一个不带正则表达式的版本：

typelist = ["appleBanana", "bananaFruit", "cherryBlossom"]

for s in typelist:
    c, c2 = [], []
    for ch in s:
        if ch.isupper():
            c, c2 = c2, c
        c.append(ch)
    print(''.join(c2).title(), ''.join(c).title())

打印：

Apple Banana
Banana Fruit
Cherry Blossom

编辑：

typelist = ["appleBanana", "bananaFruit", "cherryBlossom", 'problemSolvingAndDataAnalysis']

out = []
for s in typelist:
    words = [[]]
    for ch in s:
        if ch.isupper():
            words.append([])
        words[-1].append(ch)
    out.append(' '.join(''.join(w).title() for w in words))

print(out)

打印：

['Apple Banana', 'Banana Fruit', 'Cherry Blossom', 'Problem Solving And Data Analysis']