python subset code example
Example 1: dataframe slice by list of values
In [1]: df = pd.DataFrame({'A': [5,6,3,4], 'B': [1,2,3,5]})
In [2]: df
Out[2]:
A B
0 5 1
1 6 2
2 3 3
3 4 5
In [3]: df[df['A'].isin([3, 6])]
Out[3]:
A B
1 6 2
2 3 3
Example 2: python subset
A = {1, 2, 3}
B = {1, 2, 3, 4, 5}
print(A.issubset(B))
print(B.issubset(A))
Example 3: python - row slice dataframe by number of rows
df.iloc[[1, 5]]
df.iloc[1:6]
df.iloc[[1, 5], df.columns.get_loc('Shop')]
df.iloc[[1, 5], df.columns.get_indexer(['Shop', 'Category'])]
Example 4: select columns to include in new dataframe in python
new = old.filter(['A','B','D'], axis=1)
Example 5: how to check if a list is a subset of another list
if(all(x in test_list for x in sub_list)):
flag = True