我正在嘗試在 Stepik 上解決這個問題：具有名稱的資料框my_stat包含 4 列：session_value, group, time, n_users。在 variables 中n_users，我們將所有負值替換為的中值n_users（當然不包括負值）。這是我寫的：
import pandas as pd
import numpy as np
my_stat = my_stat['session_value'].replace(np.nan, 0)
my_stat.loc[my_stat['n_users'] < 0, 'n_users'] = my_stat['n_users'].median()
但我收到此錯誤：
Error:
Traceback (most recent call last):
File "jailed_code", line 25, in <module>
med = my_stat['n_users'].median()
File "/home/stepic/instances/master-plugins/sandbox/python3/lib/python3.6/site-packages/pandas/core/series.py", line 871, in __getitem__
result = self.index.get_value(self, key)
File "/home/stepic/instances/master-plugins/sandbox/python3/lib/python3.6/site-packages/pandas/core/indexes/base.py", line 4405, in get_value
return self._engine.get_value(s, k, tz=getattr(series.dtype, "tz", None))
File "pandas/_libs/index.pyx", line 80, in pandas._libs.index.IndexEngine.get_value
File "pandas/_libs/index.pyx", line 90, in pandas._libs.index.IndexEngine.get_value
File "pandas/_libs/index.pyx", line 135, in pandas._libs.index.IndexEngine.get_loc
File "pandas/_libs/index_class_helper.pxi", line 109, in pandas._libs.index.Int64Engine._check_type
KeyError: 'n_users'
我該如何解決？
uj5u.com熱心網友回復：
改變你的線路
my_stat = my_stat['session_value'].replace(np.nan, 0)
對此
my_stat['session_value'] = my_stat['session_value'].replace(np.nan, 0)
或者，更好的是，使用fillna：
my_stat['session_value'] = my_stat['session_value'].fillna(0)
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