擅长:python、mysql、java
<p>我相信你需要<a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.reindex.html" rel="nofollow noreferrer">^{<cd1>}</a>:</p>
<pre><code>df = (df.set_index('Day')
.reindex(pd.date_range(df['Day'].min(), df['Day'].max()), fill_value=0)
.reset_index())
print (df)
index Movie Rating
0 2017-01-01 GreatGatsby 5
1 2017-01-02 TopGun 5
2 2017-01-03 Deadpool 1
3 2017-01-04 0 0
4 2017-01-05 0 0
5 2017-01-06 0 0
6 2017-01-07 0 0
7 2017-01-08 0 0
8 2017-01-09 0 0
9 2017-01-10 PlanetOfApes 2
</code></pre>