python not in list

1[x for x in item if x not in z]

1>>> df
2  countries
30        US
41        UK
52   Germany
63     China
7>>> countries
8['UK', 'China']
9>>> df.countries.isin(countries)
100    False
111     True
122    False
133     True
14Name: countries, dtype: bool
15>>> df[df.countries.isin(countries)]
16  countries
171        UK
183     China
19>>> df[~df.countries.isin(countries)]
20  countries
210        US
222   Germany

1arr = ['a','b','c','d','e','f']
2
3if 'g' not in arr:
4    print('g is not in the list')

1>>> 3 not in [2, 3, 4]
2False
3>>> 3 not in [4, 5, 6]
4True

1a = [1, 2, 3, 4, 5, 6]
2b = 7
3c = 4
4
5# use "not in" to check if something is not an element of a list
6# use "in" to check if something is an element of a list
7
8if b not in a:
9  print('True')
10else:
11  print('False')
12
13if c in a:
14  print('True')
15else:
16    print('False')
17