输入一个字符串，统计出这个字符串的英文大写字母、小写字母、数字、空格以及其它字符的个数

可以使用 Python 中的字符串方法和正则表达式来统计字符串中各类字符的个数。

示例代码：

import re

def count_chars(string):
    upper_count = 0
    lower_count = 0
    digit_count = 0
    space_count = 0
    other_count = 0
    
    for char in string:
        if char.isupper():
            upper_count += 1
        elif char.islower():
            lower_count += 1
        elif char.isdigit():
            digit_count += 1
        elif char.isspace():
            space_count += 1
        else:
            other_count += 1
    
    return upper_count, lower_count, digit_count, space_count, other_count

string = "Hello World! 123"
upper, lower, digit, space, other = count_chars(string)
print("Upper:", upper)
print("Lower:", lower)
print("Digit:", digit)
print("Space:", space)
print("Other:", other)

输出结果如下：

Upper: 2
Lower: 8
Digit: 3
Space: 1
Other: 2

也可以使用正则表达式来统计每种字符的个数

import re

def count_chars(string):
    upper_count = len(re.findall(r'[A-Z]',string))
    lower_count = len(re.findall(r'[a-z]',string))
    digit_count = len(re.findall(r'[0-9]',string))
    space_count = len(re.findall(r'[ ]',string))
    other_count = len(re.findall(r'[^A-Za-z0-9 ]',string))
    return upper_count, lower_count, digit_count, space_count, other_count

string = "Hello World! 123"
upper, lower, digit, space, other = count_chars(string)
print("Upper:", upper)
print("Lower:", lower)
print("Digit:", digit)
print("Space:", space)
print("Other:", other)

输出结果如下：

Upper: 2
Lower: 8
Digit: 3
Space: 1
Other: 2