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' , while chr(8364) returns the string '' . This is the inverse of. The valid range for the argument is from 0 through 1,114,111 (0x10FFFF in base 16).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') 973. 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
>>> 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)
