Python|切换具有相同大小写的单词中的字符

给定一个字符串，切换那些所有字符都在相同大小写的单词的字符。

例子：

Input : Geeks for Geeks
Output : Geeks FOR Geeks
Explanation: The string contains three words “Geeks”, “for”, “Geeks” out of which the word “for” contains all its characters as lower cases, therefore, toggle the case of the word. Print the remaining characters as it is.

Input : HELLO world
Output : hello WORLD

简单的方法：
分别考虑字符串中的每个单词。设置两个标志，一个检查字符的所有大小写是否相同，另一个检查字符是大写还是小写。

if all the characters are in the same case 
    if all the characters are lower case 
       then convert into upper case
    else convert into lower case
else print the same word

下面是实现：

# Python program to toggle character in 
# a string only with same case
  
# Function to toggle case 
def toggle(s):
      
    word_list = s.split()
      
    # traverse through each word of the string
    for word in word_list:
          
        # initially assume all the characters in word
        # are in the same case and set the flag to 1
        flag = 1
          
        # check the case of the first
        # character in the word
        if word[0].islower():
              
            # if the case is lower set the r value to 1
            r = 1
              
            # traverse through the remaining 
            # characters in the word
            for j in word:
                  
                # if any of the characters are in upper case
                if j.isupper():
                      
                    # then set the flag to 0
                    flag = 0
                    break
                  
        else:
            # if the case is upper 
            # set the r value to 1
            r = 0
              
            # traverse through the remaining
            # characters in the word
            for j in word:
                  
                # if any of the characters are in lower case
                if j.islower():
                      
                    # then set the flag to 0
                    flag = 0
                    break
          
        # if the flag is 0 then print the word as it is     
        if flag == 0: print(word, end =" ")
      
        else:
            # if the word is in lower case 
            # then print the word in upper case
            if r == 1: print(word.upper(), end =" ")
              
            # if the word is in upper case 
            # then print the word in lower case
            else: print(word.lower(), end =" ")
              
# driver code
s = 'Geeks for Geeks'
toggle(s)

输出：

Geeks FOR Geeks

使用库函数：
我们还可以使用直接库函数来检查单个单词是低位还是高位。

# Python program to toggle character in 
# a string only with same case
  
# Function to toggle case 
def toggle(s):
      
    word_list = s.split()
      
    # traverse through each word of the string
    for word in word_list:
          
        if word.islower() :
            print(word.upper(), end =" ")
        elif word.isupper() :
            print(word.lower(), end =" ")
        else :
            print(word, end =" ")
              
# driver code
s = 'Geeks for Geeks'
toggle(s)

输出：

Geeks FOR Geeks