AttributeError：__enter__与read_parquet一起使用with语句时

Question

I want to open all parquet files existing in a specific folder and draw a scatter plot with it. I used following code:

for file in glob.glob("*.parquet"):
    with pd.read_parquet(file, columns=["cordx", "cordy"]) as df:
        make some scaterplot

Files can be found as I let python print the file sucessfully. But i recive AttributeError: __enter__ . And read_parquet is the corredct way to open those files. When I dont use columns=[ ] I get pyarrow.lib.ArrowIOError: Arrow error: Out of memory: malloc of size 9771487328 failed error because the files are very big. So its necessary to load only those columns.

Answer 1

This error tells you that pandas.read_parquet does not have a context manager implemented which means that you cannot call it using with because __enter__ and __exit__ methods are missing. Look in here How to read a Parquet file into Pandas DataFrame?