英文文档：
-
chr(i) - Return the string representing a character whose Unicode code point is the integer i. For example,
chr(97)returns the string'a',whilechr(8364)returns the string'€'. This is the inverse oford(). - The valid range for the argument is from 0 through 1,114,111 (0x10FFFF in base 16).
ValueErrorwill be raised if i is outside that range - 说明：
- 1. 函数返回整形参数值所对应的Unicode字符的字符串表示
>>> chr(97) #参数类型为整数
'a'
>>> chr('97') #参数传入字符串时报错
Traceback (most recent call last):
File "<pyshell#6>",line 1,in <module>
chr('97')
TypeError: an integer is required (got type str)
>>> type(chr(97)) #返回类型为字符串
<class 'str'>
>>> chr(97)
'a'
>>> ord('a')
97
3. 传入的参数值范围必须在0-1114111(十六进制为0x10FFFF)之间，否则将报ValueError错误
>>> chr(-1) #小于0报错
Traceback (most recent call last):
File "<pyshell#10>",in <module>
chr(-1)
ValueError: chr() arg not in range(0x110000)
>>> chr(1114111)
'\U0010ffff'
>>> chr(1114112) #超过1114111报错
Traceback (most recent call last):
File "<pyshell#13>",in <module>
chr(1114112)
ValueError: chr() arg not in range(0x110000)
简单描述
chr接收一个数字,找到这个数字对应的ascii里的元素(只能接受数字)
a = chr(65)
print(a) #结果: A
ord()接收一个字符,返回这个字符对应的数字.(只能接受一个字符)
b = ord('a')
print(b) #结果: 97