w3resource

Python: Filter the positive numbers from a list

Python Basic: Exercise-114 with Solution

Write a Python program to filter the positive numbers from a list.

Positive Numbers: Any number above zero is known as a positive number. Positive numbers are written without any sign or a '+' sign in front of them and they are counted up from zero, i.e. 1, + 2, 3, +4 etc.

Pictorial Presentation:

Filter the positive numbers from a list

Sample Solution-1:

Python Code:

nums = [34, 1, 0, -23, 12, -88]
print("Original numbers in the list: ",nums)
new_nums = list(filter(lambda x: x >0, nums))
print("Positive numbers in the said list: ",new_nums)

Sample Output:

Original numbers in the list:  [34, 1, 0, -23, 12, -88]
Positive numbers in the said list:  [34, 1, 12]

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:


Sample Solution-2:

Python Code:

nums = [34, 1, 0, -23, 12, -88]
print("Original numbers in the list: ",nums)
print("Positive numbers in the said list: ")
for pos_nums in nums:
   if pos_nums > 0:
      print(pos_nums, end = " ")

Sample Output:

Original numbers in the list:  [34, 1, 0, -23, 12, -88]
Positive numbers in the said list: 
34 1 12 

Flowchart:

Flowchart: Filter the positive numbers from a list.

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:


Sample Solution-3:

Python Code:

nums = [34, 1, 0, -23, 12, -88]
print("Original numbers in the list: ",nums)
pos_nums = [n for n in nums if n> 0]
print("Positive numbers in the said list: ",*pos_nums)

Sample Output:

Original numbers in the list:  [34, 1, 0, -23, 12, -88]
Positive numbers in the said list:  34 1 12

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:


Python Code Editor:

 

Have another way to solve this solution? Contribute your code (and comments) through Disqus.

Previous: Write a Python program to input a number, if it is not a number generates an error message.
Next: Write a Python program to compute the product of a list of integers (without using for loop).

What is the difficulty level of this exercise?

Test your Python skills with w3resource's quiz



Python: Tips of the Day

Try-catch-else construct:

try:
  foo() 
except Exception: 
  print("Exception occured")
else:
  print("Exception didnt occur")
finally:
  print("Always gets here")