Python program to print negative numbers in a list

Given a list of numbers, write a Python program to print all negative numbers in the 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

Method:  Using numpy.array

Python3

# Python program to print negative Numbers in a List
import numpy as np
# list of numbers
list1 = [-10, 21, 4, -45, -66, 93, -11]


# Using numpy to print the negative number
temp = np.array(list1)
neg_nos = temp[temp <= 0]

print("Negative numbers in the list: ", *neg_nos)

Output:

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

Method : Using Recursion

Python3

#Recursive function to check current element negative or not
def PrintNegative(itr,list1):
  if itr == len(list1): #base condition
    return
  if list1[itr] < 0: #check negative number or not
    print( list1[itr],end = " ")
  PrintNegative(itr+1,list1) #recursive function call

list1 = [-1,8,9,-5,7]
PrintNegative(0,list1)

Output

-1 -5