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Question

我一直在努力使用Python3.5中关于航空乘客数据集的代码

from pandas import read_csv
from pandas import DataFrame
from pandas import Grouper
from matplotlib import pyplot

series = read_csv('AirPassengers.csv', header=None, index_col=0, 
parse_dates=True, squeeze=True)
groups = series['1949':'1960'].groupby(Grouper(freq='A'))
years = DataFrame()
pyplot.figure()
i = 1
n_groups = len(groups)
for name, group in groups:
    pyplot.subplot((n_groups*100) + 10 + i)
    i += 1
    pyplot.plot(group)
pyplot.show()

我得到以下错误：

    return self._engine.get_loc(self._maybe_cast_indexer(key))
  File "pandas\_libs\index.pyx", line 140, in pandas._libs.index.IndexEngine.get_loc
  File "pandas\_libs\index.pyx", line 162, in pandas._libs.index.IndexEngine.get_loc
  File "pandas\_libs\hashtable_class_helper.pxi", line 1492, in pandas._libs.hashtable.PyObjectHashTable.get_item
  File "pandas\_libs\hashtable_class_helper.pxi", line 1500, in pandas._libs.hashtable.PyObjectHashTable.get_item
KeyError: '1949'

Answer 1

我假设您使用的是Kaggle AirPassengers数据集。它有一个头，所以你应该省略header=None。

series = read_csv('AirPassengers.csv', index_col=0, parse_dates=True, squeeze=True)

groups = series['1949':'1960'].groupby(Grouper(freq='A'))
pyplot.figure()
i = 1
n_groups = len(groups)

对于subplot:您可以使用subplot(xyz)，但请注意，所有整数(x，y，z)必须小于10才能使此形式生效。

for name, group in groups:
    pyplot.subplot(n_groups, 1, i)
    i += 1
    pyplot.plot(group)
pyplot.show()