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Python program to print positive numbers in a list

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  • Difficulty Level : Easy
  • Last Updated : 25 Sep, 2022
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Given a list of numbers, write a Python program to print all positive numbers in given list. 

Example:

Input: list1 = [12, -7, 5, 64, -14]
Output: 12, 5, 64

Input: list2 = [12, 14, -95, 3]
Output: [12, 14, 3]

Example #1: Print all positive numbers from given list using for loop Iterate each element in the list using for loop and check if number is greater than or equal to 0. If the condition satisfies, then only print the number. 

Python3




# Python program to print positive Numbers in a List
 
# list of numbers
list1 = [11, -21, 0, 45, 66, -93]
 
# iterating each number in list
for num in list1:
 
    # checking condition
    if num & gt
    = 0:
        print(num, end=& quot
              & quot
              )


Output:

11 0 45 66 

  Example #2: Using while loop 

Python3




# Python program to print positive Numbers in a List
 
# list of numbers
list1 = [-10, 21, -4, -45, -66, 93]
num = 0
 
# using while loop    
while(num < len(list1)):
     
    # checking condition
    if list1[num] >= 0:
        print(list1[num], end = " ")
     
    # increment num
    num += 1
    


Output:

21 93 

  Example #3: Using list comprehension 

Python3




# Python program to print Positive Numbers in a List
 
# list of numbers
list1 = [-10, -21, -4, 45, -66, 93]
 
# using list comprehension
pos_nos = [num for num in list1 if num >= 0]
 
print("Positive numbers in the list: ", *pos_nos)


Output:

Positive numbers in the list:  45 93

  Example #4: Using lambda expressions 

Python3




# Python program to print positive Numbers in a List
 
# list of numbers
list1 = [-10, 21, 4, -45, -66, 93, -11]
 
 
# we can also print positive no's using lambda exp.
pos_nos = list(filter(lambda x: (x >= 0), list1))
 
print("Positive numbers in the list: ", *pos_nos)


Output:

Positive numbers in the list:  21, 4, 93

Method: Using enumerate function 

Python3




l=[12, -7, 5, 64, -14]
print([a for j,a in enumerate(l) if a>=0])


Output

[12, 5, 64]

Method:Using startswith() method

Python3




# Python program to print positive numbers in a List
 
# list of numbers
list1 = [11, -21, 0, 45, 66, -93]
res=[]
list2=list(map(str,list1))
for i in range(0,len(list2)):
    if( not list2[i].startswith("-") and list2[i] !="0"):
        res.append(str(list1[i]))
res=" ".join(res)
print(res)


Output

11 45 66

Auxiliary Space: O(1)

Method: Using Numpy Array: 

Python




# Python program to print Positive Numbers in a List
import numpy as np
# list of numbers
list1 = np.array([-10, -21, -4, 45, -66, 93])
 
# using numpy Array
pos_nos = list1[list1 >=0];
 
print("Positive numbers in the list: ", *pos_nos)


Output:

Positive numbers in the list:  45 93

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