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Python异常 ValueError的问题_python_
2023-05-25
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简介 Python异常 ValueError的问题_python_
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 "", line 1, in 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 "", line 1, in 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 "", line 1, in 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。
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