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Python String casefold()用法及代码示例


Python String casefold() 方法用于实现无大小写的字符串匹配。它类似于 lower() 字符串方法,但 case 删除了字符串中存在的所有大小写区别。即在比较时忽略案例。

用法: 

string.casefold()

参数:

casefold() 方法不带任何参数。



返回值:

它返回转换为小写的字符串的大小写折叠字符串。

示例 1:将字符串转换为小写

Python3


# Python program to convert string in lower case
string = "GEEKSFORGEEKS"
  
# print lowercase string
print("lowercase string:",string.casefold())

输出:

lowercase string:geeksforgeeks

示例 2:检查字符串是否为回文

Python3


# Program to check if a string
#  is palindrome or not
  
# change this value for a different output
str = 'geeksforgeeks'
  
# make it suitable for caseless comparison
str = str.casefold()
  
# reverse the string
rev_str = reversed(str)
  
# check if the string is equal to its reverse
if str == rev_str:
      print("palindrome")
else:
      print("not palindrome")

输出:

not palindrome

示例 3:计算字符串中的元音

Python3


# Program to count 
# the number of each 
# vowel in a string
  
# string of vowels
v = 'aeiou'
  
# change this value for a different result
str = 'Hello, have you try geeksforgeeks?'
  
# input from the user
# str = input("Enter a string:")
  
# caseless comparisions
str = str.casefold()
  
# make a dictionary with 
# each vowel a key and value 0
c = {}.fromkeys(v,0)
  
# count the vowels
for char in str:
          if char in c:
                  c[char] += 1
print(c)

输出:

{'a':1, 'e':6, 'i':0, 'o':3, 'u':1}




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注:本文由纯净天空筛选整理自GeeksforGeeks大神的英文原创作品 Python String casefold() Method。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。