list comprehesion created by hygull - https://repl.it/FFTh/5

list comprehesion.py

"""
    Coded on : 10 January 2017.
    Aim : Short hand notation for creating list in Python (3 examples)
    Python version : 2.7.10
"""

#To create a list of lists each list denoting a table of numbers in range [1...10] one after one
tables=[[i*j for j in range(1,11)]  for i in range(1,11)]
for lst in tables:
  for num in lst:
    print num,"\t",
  print "\n"

#To create a list of even numbers that exist in range [1...20]
evens_list=[even for even in range(1,21) if even%2==0]
print evens_list
print "\n"

#To remove 0 entries from list
nums_list=[2,4,0,12,34,4,0,1,7,0,2,-6,0,-23,0]
print "Before removing the 0 entries"
print nums_list
l = [num for num in nums_list if num]
print "After removing the 0 entries"
print l 


""" OUTPUT

1 	2 	3 	4 	5 	6 	7 	8 	9 	10 	

2 	4 	6 	8 	10 	12 	14 	16 	18 	20 	

3 	6 	9 	12 	15 	18 	21 	24 	27 	30 	

4 	8 	12 	16 	20 	24 	28 	32 	36 	40 	

5 	10 	15 	20 	25 	30 	35 	40 	45 	50 	

6 	12 	18 	24 	30 	36 	42 	48 	54 	60 	

7 	14 	21 	28 	35 	42 	49 	56 	63 	70 	

8 	16 	24 	32 	40 	48 	56 	64 	72 	80 	

9 	18 	27 	36 	45 	54 	63 	72 	81 	90 	

10 	20 	30 	40 	50 	60 	70 	80 	90 	100 	

[2, 4, 6, 8, 10, 12, 14, 16, 18, 20]


Before removing the 0 entries
[2, 4, 0, 12, 34, 4, 0, 1, 7, 0, 2, -6, 0, -23, 0]
After removing the 0 entries
[2, 4, 12, 34, 4, 1, 7, 2, -6, -23]
"""