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I have a list like this:
A=[(1,'A'),(2,'H'),(3,'K'),(4,'J')]
Each member of this list is like this: (number, string)
Now if I want to select the members if the number is bigger than 2 and write the string, what should I do?
For example:
selecting the member with a number bigger than 2. the output should be: 'K','J'
726
You can define any complicated condition on a list element to decide whether to filter it out or not. To do this, create a function (e.g., condition(x) ) that takes one list element as input and returns the Boolean value True if the condition is met or False otherwise.
To filter items of a Tuple in Python, call filter() builtin function and pass the filtering function and tuple as arguments. The filtering function should take an argument and return True if the item has to be in the result, or False if the item has to be not in the result.
If you specifically want to sort a list of tuples by a given element, you can use the sort() method and specify a lambda function as a key.
Short answer: To filter a list of lists for a condition on the inner lists, use the list comprehension statement [x for x in list if condition(x)] and replace condition(x) with your filtering condition that returns True to include inner list x , and False otherwise.
Use a list comprehension:
[y for x,y in A if x>2]
Demo:
>>> A=[(1,'A'),(2,'H'),(3,'K'),(4,'J')]
>>> [y for x,y in A if x>2]
['K', 'J']
>>>
try :
In [4]: [x[1] for x in A if x[0] > 2]
Out[4]: ['K', 'J']
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