Python pandas - read_csv 是否保持文件打开？
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Python pandas - Does read_csv keep file open?
提问by nivniv
When using pandas read_csv()method, does it keep the file open or it closes it (discard the file descriptor)?
使用 pandasread_csv()方法时，它是保持文件打开还是关闭它（丢弃文件描述符）？
If it keeps it, how do I close it after I finish using the dataframe?
如果它保留它，我如何在使用完数据框后关闭它？
采纳答案by Andy Hayden
If you pass it an open file it will keep it open (reading from the current position), if you pass a string then read_csvwill open and close the file.
如果您传递一个打开的文件，它将保持打开状态（从当前位置读取），如果您传递一个字符串，read_csv则将打开和关闭文件。
In python if you open a file but forget to close it, python will close it for you at the end of the function block (during garbage collection).
在 python 中，如果你打开一个文件但忘记关闭它，python 会在函数块的末尾（在垃圾收集期间）为你关闭它。
def foo():
f = open("myfile.csv", "w")
...
f.close() # isn't actually needed
i.e. if you call a python function which opens a file, unless the file object is returned, the file is automagicallymatically closed.
即，如果您调用打开文件的python 函数，除非返回文件对象，否则文件将自动神奇地关闭。
Note: The preferred syntax is the withblock (which, as well as closing fat the end of the withblock, defines the fvariable only inside the withblock):
注意：首选语法是with块（它以及f在with块末尾关闭，f仅在with块内定义变量）：
def foo():
with open("myfile.csv", "w") as f:
...
