ord() / chr() 随机验证码生成

https://github.com/TheAlgorithms/Python/blob/master/strings/upper.py

def upper(word: str) -> str:
    """ 
    Will convert the entire string to uppercase letters 
    
    >>> upper("wow")
    'WOW'
    >>> upper("Hello")
    'HELLO'
    >>> upper("WHAT")
    'WHAT'
    
    >>> upper("wh[]32")
    'WH[]32'
    """

    # converting to ascii value int value and checking to see if char is a lower letter
    # if it is a capital letter it is getting shift by 32 which makes it a capital case letter
    return "".join(
        chr(ord(char) - 32) if 97 <= ord(char) <= 122 else char for char in word
    )


if __name__ == "__main__":
    from doctest import testmod

    testmod()

https://github.com/TheAlgorithms/Python/blob/master/strings/lower.py

def lower(word: str) -> str:

    """ 
    Will convert the entire string to lowecase letters 
    
    >>> lower("wow")
    'wow'
    >>> lower("HellZo")
    'hellzo'
    >>> lower("WHAT")
    'what'
    
    >>> lower("wh[]32")
    'wh[]32'
    >>> lower("whAT")
    'what'
    """

    # converting to ascii value int value and checking to see if char is a capital letter
    # if it is a capital letter it is getting shift by 32 which makes it a lower case letter
    return "".join(
        chr(ord(char) + 32) if 65 <= ord(char) <= 90 else char for char in word
    )

if __name__ == "__main__":
    from doctest import testmod

    testmod()

转载https://www.cnblogs.com/sui776265233/p/9103251.html

ord()函数主要用来返回对应字符的ascii码，chr()主要用来表示ascii码对应的字符他的输入时数字，可以用十进制，也可以用十六进制。

例如：

print ord('a)
#97
print chr(97)
#a
print chr(0x61)
#a

下面的例子实现对字符串str1里面所有的字符，转换成ascii码中比他们小一位的字符。

str1='asdfasdf123123'

for i in rang(len(str1)):

     print (chr(ord(str1[i])-1))

可以用来生成随机验证码（由大写字母和数字构成）：

import random
# 1X3Y3ZX
def make_code(size=7):
    res = ''
    for i in range(size):
        # 循环一次则得到一个随机字符（字母/数字）
        s = chr(random.randint(65, 90))
        num = str(random.randint(0, 9))
        res += random.choice([s, num])
    return res

res=make_code()
print(res)