Python----Statistics the number of English letters, spaces, numbers and other characters in a string.

1. Enter a line of characters to count the number of English letters, spaces, numbers and other characters.

Method 1: Use regular expressions

import re
 str1 = input("Please enter a line of string:")
 alpha = 0 #English alphabet
 space = 0 #space
 digit = 0 #number
 other = 0 #Other
 for i in str1:
 # print(i)
     if (r"[A-Za-z]",i):
         alpha += 1
     elif (r"\s", i):
         space += 1
     elif (r"\d",i):
         digit += 1
     else:
         other += 1
 print(f"{str1} The number of English letters is: {alpha}")
 print(f"{str1}' number of spaces: { space}")
 print(f"{str1}' number of numbers: {digit}")
 print(f"{str1}'s number of other characters is: {other}")

Method 2:

While True:
     str1 = input("Please enter a line of string:")
     alpha = 0 #English alphabet
     space = 0 #space
     digit = 0 #number
     other = 0 #Other
     for i in str1:
         if ():
             alpha += 1
         elif ():
             space += 1
         elif ():
             digit += 1
         else:
             other += 1
     print(f"{str1} The number of English letters is: {alpha}")
     print(f"{str1}' number of spaces: { space}")
     print(f"{str1}' number of numbers: {digit}")
     print(f"{str1}'s number of other characters is: {other}")

Method 3: Use list[]

While True:
     str1 = input("Please enter a line of string:")
     alpha = [] #English alphabet
     space = [] #space
     digit = [] #number
     other = [] #Other
     for i in str1:
         if ():
             (i)
         elif ():
             (i)
         elif ():
             (i)
         else:
             other += 1
     The number of English letters in print(f"{str1} is: {len(alpha)}")
     print(f"{str1} has the number of spaces: {len(space)}")
     print(f"{str1} number of numbers: {len(digit)}")
     print(f"{str1}'s number of other characters is: {len(other)}")