python list comprehension
nums = [4, -7, 9, 1, -1, 8, -6]
half_of_nums = [x/2 for x in nums] #[2, -3.5, 4.5, 0.5, -0.5, 4, -3]
#optionally you can add an if statement like this
half_of_positive_nums = [x/2 for x in nums if x>=0] #[2, 4.5, 0.5, 4]python list comprehension
nums = [4, -7, 9, 1, -1, 8, -6]
half_of_nums = [x/2 for x in nums] #[2, -3.5, 4.5, 0.5, -0.5, 4, -3]
#optionally you can add an if statement like this
half_of_positive_nums = [x/2 for x in nums if x>=0] #[2, 4.5, 0.5, 4]python list comprehension
#example: removing common elements found in `a` from `b`.
a = [1,2,3,4,5]
b = [5,6,7,8,9]
# desired output: [1,2,3,4]
# gets each item found in `a` AND not in `b`
print([i for i in a if i not in b])python list comprehension
nums = [3578, 6859, 35689, 268]
half_of_nums = [x/2 for x in nums]python list comprehension
lst=[1,2,3,4,5]
lst2=[item for item in lst if <condition>]
# generates a list based on another list and an if statement. the code above is a replacement for:
lst=[1,2,3,4,5]
lst2=[]
for item in lst:
if <condition>:
lst2.append(item)python list comprehension
# List comprehension example
list = [0 for i in range(10)]
# Makes a list of 10 zeros (Change 0 for different result
# and range for different length)
# Nested List
list = [[0] * 5 for i in range(10)]
# Makes a nested list of 10 list containing 5 zeros (You can also change
# all of the int to produce different results)python list comprehension
# PYTHON LIST COMPREHENSION
#ordinary syntax:
numbers = []
for x in range(10):
numbers.append(x)
print(numbers)
#LIST COMPREHENSION syntax:
numbers = [x for x in range(10)]
print(numbers)
#Both get the same result.
#Check the official documentation:
'''
https://www.w3schools.com/python/python_lists_comprehension.asp
'''python list comprehension
[expression for element in source_list]python list comprehension
# A list comprehnsion is a for loop on a single line
# To create a list comprehension, swap the two lines in the for loop.
# Here we use PyBIDS to extract the relative path for each file:
for fmri in fmri_078:
print(fmri.relpath)
# And here is the equivalent statement as a list comprehension.
# It must be enclosed in square brackets.
# It swaps the order of the lines and loses the colon and indentation
[ print(fmri.relpath) for fmri in fmri_078 ]Python List Comprehension
fruits = ["apple", "banana", "cherry", "kiwi", "mango"]
newlist = []
for x in fruits:
if "a" in x:
newlist.append(x)
print(newlist)Copyright © 2021 Codeinu
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