[英]How to add method to existing class in Python?
我有這個非常方便的高級pd.DataFrame
保存功能,我想添加到pandas
。 如何將此方法添加到pd.DataFrame
類?
def to_file(df, path, sep="\t", compression="infer", pickled="infer", verbose=False, **args):
_ , ext = os.path.splitext(path)
# Serialization
if pickled == "infer":
if ext in {".pkl", ".pgz", ".pbz2"}:
pickled = True
else:
pickled = False
# Compression
if compression == "infer":
if pickled:
if ext == ".pkl":
compression = None
if ext == ".pgz":
compression = "gzip"
if ext == ".pbz2":
compression = "bz2"
else:
compression = None
if path.endswith(".gz"):
compression = "gzip"
if path.endswith(".bz2"):
compression = "bz2"
if verbose:
print(
f"path:\t{path}",
f"sep:\t{repr(sep)}",
f"compression:\t{compression}",
f"pickled:\t{pickled}",
sep="\n",
file=sys.stderr,
)
if pickled == False:
df.to_csv(path, sep=sep, compression=compression, **args)
if pickled == True:
df.to_pickle(path, compression=compression, **args)
使用python類繼承。 這將允許您使用Pandas數據框中的所有方法,並且仍然定義自己的方法。
import pandas as pd
class NewDF(pd.DataFrame)
def __init__(self, *args):
pd.DataFrame.__init__(self, *args)
def to_file(df, path, sep="\t", compression="infer", pickled="infer", verbose=False, **args):
...
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