if else in a list comprehension
Python’s conditional expression is a if C else b and can’t be used as:
list-comprehension
Creating a dictionary from a csv file?
I am trying to create a dictionary from a csv file. The first column of the csv file contains unique keys and the second column contains values. Each row of the csv file represents a unique key, value pair within the dictionary. I tried to use the csv.DictReader and csv.DictWriter classes, but I could only figure out how to generate a new dictionary for each row. I want one dictionary. Here is the code I am trying to use:
Pythonic way to print list items
I would like to know if there is a better way to print all objects in a Python list than this :
Why is there no tuple comprehension in Python?
As we all know, there’s list comprehension, like
Double Iteration in List Comprehension
In Python you can have multiple iterators in a list comprehension, like
Understanding nested list comprehension
I want to understand nested list comprehension.
Below, I listed a list comprehension expression and their for loop equivalent.
I wonder if my understanding is correct on those.
Why is a list comprehension so much faster than appending to a list?
I was wondering why list comprehension is so much faster than appending to a list. I thought the difference is just expressive, but it’s not.
List comprehension with if statement
I want to compare 2 iterables and print the items which appear in both iterables.
Python’s most efficient way to choose longest string in list?
I have a list of variable length and am trying to find a way to test if the list item currently being evaluated is the longest string contained in the list. And I am using Python 2.6.1
List comprehension vs generator expression’s weird timeit results?
I was answering this question, I preferred generator expression here and used this, which I thought would be faster as generator doesn’t need to create the whole list first: