使用 pandas 读取csv文件时需要在路径名前使用'r' [英] Need of using 'r' before path-name while reading a csv file with pandas

问题描述

一个新手. 有人可以告诉我为什么在某些情况下在以下函数的路径名称前使用"r"吗?

a newbie here. Could someone tell me why do we use an 'r' in some cases before the path name in the following function?:

df = pd.read_csv(r"Path_name")

预先感谢

推荐答案

在Python中，反斜杠用于表示特殊字符.

In Python, backslash is used to signify special characters.

例如"hello \ nworld"-"\ n"表示换行符.尝试打印.

e.g. "hello\nworld" -- the "\n" means a newline. Try printing it.

Windows上的路径名称中往往带有反斜杠.但是我们希望它们表示实际的反斜杠，而不是特殊字符.

Path names on Windows tend to have backslashes in them. But we want them to mean actual backslashes, not special characters.

r代表原始"，将导致字符串中的反斜杠被解释为实际的反斜杠，而不是特殊字符.

r stands for "raw" and will cause backslashes in the string to be interpreted as actual backslashes rather than special characters.

例如r"hello \ nworld"的字面意思是字符"hello \ nworld".再次尝试打印.

e.g. r"hello\nworld" literally means the characters "hello\nworld". Again, try printing it.

Python文档中提供了更多信息，建议您搜索此类问题.

More info is in the Python docs, it's a good idea to search them for questions like these.

https://docs.python.org/3/tutorial/introduction. html#strings

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