chr()和ord()

ord()把ASCII碼轉成對應的數位，chr()把數位轉成對應的ASCII碼

s1 = 'a'
s2 = 99
print(ord(s1))
print(chr(s2)) #也可輸入十六進制 如chr(0x66)的返回值是f

輸出結果分別是97和c