Python异常 ValueError
ValueError: invalid literal for int() with base 10: ‘*’
试图将一个与数字无关的类型转化为整数，会抛出该异常。
1 2 3 4 | >>> int("99 years ago.")Traceback (most recent call last): File "<stdin>", line 1, in <module>ValueError: invalid literal for int() with base 10: '99 years ago.'</module></stdin> |
规避方法：int函数参数应该合法使用。int函数使用传送门：Python中的int函数使用
ValueError: too many values to unpack (expected 2)
试图遍历字典时同时遍历键和值。
1 2 3 4 5 6 7 | >>> demo = {"China": "Beijing", "Japan": "Tokyo"}>>> for k, v in demo:... print(k, v)...Traceback (most recent call last): File "<stdin>", line 1, in <module>ValueError: too many values to unpack (expected 2)</module></stdin> |
Python只允许对字典key的遍历，因此上面的遍历方式是错误的。
规避方法
方法一：使用dict[key]的方式同时获取value
1 2 3 4 5 6 | >>> demo = {"China": "Beijing", "Japan": "Tokyo"}>>> for key in demo:... print(key, demo[key])...China BeijingJapan Tokyo |
方法二：使用items方法
1 2 3 4 5 6 7 8 | >>> demo = {"China": "Beijing", "Japan": "Tokyo", "the United States": "Washington D.C."}>>> for key, value in demo.items():... print(key, value)...China BeijingJapan Tokyothe United States Washington D.C.ValueError: binary mode doesn't take an encoding argument |
试图以二进制模式读取文件时指定编码方式。
1 2 3 4 5 6 | >>> with open("protoc-gen-go", "rb+", encoding="utf-8") as file:... data = file.read()...Traceback (most recent call last): File "<stdin>", line 1, in <module>ValueError: binary mode doesn't take an encoding argument</module></stdin> |
规避方法：避免使用encoding关键字
1 2 3 4 5 | >>> with open("protoc-gen-go", "rb+") as file:... data = file.read(10)...>>> datab'xcfxfaxedxfex07x00x00x01x03x00' |
以上为个人经验，希望能给大家一个参考，也希望大家多多支持IT俱乐部。
