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Python program to print negative numbers in a list

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  • Difficulty Level : Easy
  • Last Updated : 08 Aug, 2022
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Given a list of numbers, write a Python program to print all negative numbers in given list. 

Example:

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

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

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

Python3




# Python program to print negative 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 < 0:
       print(num, end = " ")


Output:

-21 -93 

  Example #2: Using while loop 

Python3




# Python program to print negative 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:

-10 -4 -45 -66 

  Example #3: Using list comprehension 

Python3




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


Output:

Negative numbers in the list:  -10 -21 -4 -66

  Example #4: Using lambda expressions 

Python3




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


Output:

Negative numbers in the list:  -10 -45 -66 -11

Method: Using enumerate function 

Python3




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


Output

[-7, -14]

Method : Using startswith() method

Python3




# Python program to print negative 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(list2[i].startswith("-")):
        res.append(str(list1[i]))
res=" ".join(res)
print(res)


Output

-21 -93

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