So, for example, with the list below. How can I extract and print just the number 408?
a = [[366, 408, 'Help'], [143, 99, 'Me'], [695, 140, 'Please']]
print a[0]
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The same way you extracted the first list? What have you tried for this specific problem?Sayse– Sayse2017-02-10 08:55:36 +00:00Commented Feb 10, 2017 at 8:55
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1 Answer
The short answer is to index the first sublist and then index the element of that sublist that you want to see.
In the first case below, we simply print the sublist by indexing a[0]. In the second case, we print the second element of the first sublist by indexing a[0][1] (NOTE: Python indexes start at 0)
>>> a = [[366, 408, 'Help'], [143, 99, 'Me'], [695, 140, 'Please']]
>>> print a[0]
[366, 408, 'Help']
>>> print a[0][1]
408
If per chance, you want to extract all of the second items from each of the sublists, you can use a Python for loop:
>>> for sublist in a:
print sublist[1]
408
99
140
To address the comment asking about how to extract the first and second items:
>>> temp = []
>>> for sublist in a:
temp.extend(sublist[0:2])
if len(temp) == 4: # print temp if it contains 4 elements
print(temp)
temp = temp[2:] # remove the first two elements
2 Comments
user2526448
A loop is exactly what I need. I need all of the first and second items from each sublist. Thanks!
user2526448
Do you know how to extract the first and second items from each sublist AND the first and second items from the next sublist? So like, (366, 408, 143, 99) then (143,99,695,140).