擅长:python、mysql、java
<pre><code>df = df.assign(main_hours=0)
df.loc[df.between_time(start_time='3:00', end_time='5:00').index, 'main_hours'] = 1
>>> df
dew temp main_hours
2010-01-02 00:00:00 129 -16 0
2010-01-02 01:00:00 148 -15 0
2010-01-02 02:00:00 159 -11 0
2010-01-02 03:00:00 181 -7 1
2010-01-02 04:00:00 138 -7 1
</code></pre>