内置函数值 -- chr() ord() -- 字符和ascii的转换
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).
ValueError
will 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'>
2. 它的功能与ord函数刚好相反
>>> 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>", line 1, 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>", line 1, 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
![](https://img2020.cnblogs.com/blog/1187916/202106/1187916-20210627082053046-596566365.jpg)