我有一个数据帧,我从其中删除了一些行。结果,我得到了一个数据帧,其中的索引类似于:[1,5,6,10,11]
,我想将其重置为[0,1,2,3,4]
。我该怎么做呢?
下面的方法似乎是可行的:
df = df.reset_index()
del df['index']
以下内容不起作用:
df = df.reindex()
发布于 2013-12-10 18:19:52
DataFrame.reset_index
就是你要找的东西。如果不想将其另存为列,请执行以下操作:
df = df.reset_index(drop=True)
如果您不想重新分配:
df.reset_index(drop=True, inplace=True)
发布于 2017-08-15 19:40:58
另一种解决方案是分配RangeIndex
或range
df.index = pd.RangeIndex(len(df.index))
df.index = range(len(df.index))
它更快:
df = pd.DataFrame({'a':[8,7], 'c':[2,4]}, index=[7,8])
df = pd.concat([df]*10000)
print (df.head())
In [298]: %timeit df1 = df.reset_index(drop=True)
The slowest run took 7.26 times longer than the fastest. This could mean that an intermediate result is being cached.
10000 loops, best of 3: 105 µs per loop
In [299]: %timeit df.index = pd.RangeIndex(len(df.index))
The slowest run took 15.05 times longer than the fastest. This could mean that an intermediate result is being cached.
100000 loops, best of 3: 7.84 µs per loop
In [300]: %timeit df.index = range(len(df.index))
The slowest run took 7.10 times longer than the fastest. This could mean that an intermediate result is being cached.
100000 loops, best of 3: 14.2 µs per loop
发布于 2018-11-23 02:46:32
data1.reset_index(inplace=True)
https://stackoverflow.com/questions/20490274
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