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。
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
>>> with open("protoc-gen-go", "rb+") as file: ... data = file.read(10) ... >>> data b'\xcf\xfa\xed\xfe\x07\x00\x00\x01\x03\x00'
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