我试图了解大熊猫何时创建视图以及切片时的副本。
要了解其行为，我使用了以下内容：
# check view function
import pandas as pd
import numpy as np
# create a dataframe
df = pd.DataFrame(np.random.randn(10,5), index=list('abcdeqwrty'))
# take a slice
q = df[df[1]>0.5]
# check if it is a view (and it is)
print('q is a view {}'.format(q._is_view))
# change the view by keeping four columns, still a view
q = q.filter([0,1,2,3], axis='columns')
print('q is a view {}'.format(q._is_view))
# change the view by adding a column, not a view anymore
q['one more column'] = 'mplah'
print('q is a view {}'.format(q._is_view))
可打印
q是True视图
q是一个视图True
q是一个视图False
总体趋势是什么？
非常感谢您的任何建议和有用的链接。
此致
Panos
答案 0 :(得分：0)