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。
>>> 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.'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。
>>> 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)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
>>> demo = {"China": "Beijing", "Japan": "Tokyo"}
>>> for key in demo:
... print(key, demo[key])
...
China Beijing
Japan Tokyo方法二：使用items方法
>>> demo = {"China": "Beijing", "Japan": "Tokyo", "the United States": "Washington D.C."}
>>> for key, value in demo.items():
... print(key, value)
...
China Beijing
Japan Tokyo
the 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。
>>> 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规避方法：避免使用encoding关键字
>>> with open("protoc-gen-go", "rb+") as file:
... data = file.read(10)
...
>>> data
b'\xcf\xfa\xed\xfe\x07\x00\x00\x01\x03\x00'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编程网。
