How do you add positive numbers to a list in Python?

June 23, 20227 months ago

How do you add positive numbers to a list in Python?

Python program to print positive numbers in a list

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.

# 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 >= 0:

print(num, end = ” “)

Output:

11 0 45 66

Example #2:
Using while loop

# 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

# 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

# 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

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Python Program to find Sum of Negative, Positive Even and Positive Odd numbers in a List

Given a list. The task is to find the sum of Negative, Positive Even, and Positive Odd numbers present in the List.

Examples:

Input:
-7 5 60 -34 1
Output:

Sum of negative numbers is -41 Sum of even positive numbers is 60 Sum of odd positive numbers is 6
Input:
1 -1 50 -2 0 -3
Output:
Sum of negative numbers is -6 Sum of even positive numbers is 50 Sum of odd positive numbers is 1

Negative numbers are the numbers less than 0 while positive even numbers are numbers greater than 0 and also divisible by 2. 0 is assumed to be a positive even number, in this case.

Approach:

The first approach input a list of numbers from the user.
Two loops are run, one for the positive numbers and the other for the negative numbers, computing the numbers’ summation.
If n is the size of the list of numbers,
it takes O(2n) time complexity, for iterating over the list of numbers twice.

Python3

class Sumofnumbers:

# find sum of negative numbers

def negSum(self, list):

# counter for sum of

# negative numbers

neg_sum = 0

for num in list:

# converting number

# to integer explicitly

num = int(num)

# if negative number

if(num < 0):

# simply add to the

# negative sum

neg_sum + = num

print(“Sum of negative numbers is “, neg_sum)

# find sum of positive numbers

# according to categories

def posSum(self, list):

# counter for sum of

# positive even numbers

pos_even_sum = 0

# counter for sum of

# positive odd numbers

pos_odd_sum = 0

for num in list:

# converting number

# to integer explicitly

num = int(num)

# if negative number

if(num >= 0):

# if even positive

if(num % 2 == 0):

# add to positive

# even sum

pos_even_sum + = num

else:

# add to positive odd sum

pos_odd_sum + = num

print(“Sum of even positive numbers is “,

pos_even_sum)

print(“Sum of odd positive numbers is “,

pos_odd_sum)
# input a list of numbers

list_num = [-7, 5, 60, -34, 1]
# creating an object of class

obj = Sumofnumbers()
# calling method for sum
# of all negative numbers
obj.negSum(list_num)
# calling method for
# sum of all positive numbers
obj.posSum(list_num)

Output:

Sum of negative numbers is -41 Sum of even positive numbers is 60 Sum of odd positive numbers is 6

The second approach computes the sum of respective numbers in a single loop. It maintains three counters for each of the three conditions, checks the condition and accordingly adds the value of the number in the current sum .
If n is the size of the list of numbers, it takes O(n) time complexity, for iterating over the list of numbers once.

Python3

class Sumofnumbers:

# find sum of numbers

# according to categories

def Sum(self, list):

# counter for sum

# of negative numbers

neg_sum = 0

# counter for sum of

# positive even numbers

pos_even_sum = 0

# counter for sum of

# positive odd numbers

pos_odd_sum = 0

for num in list:

# converting number

# to integer explicitly

num = int(num)

# if negative number

if(num < 0):

# simply add

# to the negative sum

neg_sum += num

# if positive number

else:

# if even positive

if(num % 2 == 0):

# add to positive even sum

pos_even_sum + = num

else:

# add to positive odd sum

pos_odd_sum + = num

print(“Sum of negative numbers is “,

neg_sum)

print(“Sum of even positive numbers is “,

pos_even_sum)

print(“Sum of odd positive numbers is “,

pos_odd_sum)
# input a list of numbers

list_num = [1, -1, 50, -2, 0, -3]
# creating an object of class

obj = Sumofnumbers()
# calling method for
# largest sum of all numbers

obj.Sum(list_num)

Output:

Sum of negative numbers is -6 Sum of even positive numbers is 50 Sum of odd positive numbers is 1

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Python program to print positive numbers in a list

In this tutorial, we will write a Python program to find and print all the positive numbers in a list. The List is an ordered set of values enclosed in square brackets [ ]. List stores some values called elements in it, which can be accessed by their particular index.

Any number which is above zero is known as a positive number. Positive numbers can be written without any sign or a ‘+’ sign in front of them. We will be following various approaches to find and print all the positive numbers in a list.

Input:
[2, 6, -10, -3, 1, -9]

Output:
[2, 6, 1]

Input:
[-2, -4, 5, -3, 0, 6, -10]

Output:
[5, 0, 6, ]

“sum positive numbers in array python” Code Answer

sum of positive numbers in array with negative python

python by ZeldaIsANerd

on Feb 03 2021 Comment

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Print all positive numbers from a list in Python

By Shriprakash Tiwari

In this tutorial, We are going to learn,
how to print all positive numbers from a list in Python.
There are various ways to find all positive numbers from a list in Python. As we know that elements of the list are stored in [ ] braces separated by a comma (,). To find positive numbers from the list, We will generate a random list. Using the same list we will try to find all positive numbers from the same list.

Python Program to Put Positive and Negative Numbers in Separate List using For Loop

In thispython program, we are usingFor Loopto iterate every element in a givenList. Inside thePythonloop, we are using the If statement to check whether the list item is Positive or Negative. Based on the result, we are appending that item to the Positive list or the Negative list.

# Python Program to Put Positive and Negative Numbers in Separate List NumList = [] Positive = [] Negative = [] Number = int(input(“Please enter the Total Number of List Elements : “)) for i in range(1, Number + 1): value = int(input(“Please enter the Value of %d Element : ” %i)) NumList.append(value) for j in range(Number): if(NumList[j] >= 0): Positive.append(NumList[j]) else: Negative.append(NumList[j]) print(“Element in Positive List is : “, Positive) print(“Element in Negative List is : “, Negative)

In this python program, the User entered List items = [12, -34, 55, -87, 67]

For Loop – First Iteration:for 0 in range(0, 5). The condition is True. So, it enters into theIf Statement
if(NumList[0] >= 0) => if(12 >= 0) – Condition is True
Positive.append(NumList[0]) => Positive= [12]

Second Iteration:for 1 in range(0, 5) –Condition is True
if(NumList[1] >= 0) => if(-34 >= 0) – Condition is False. So, itenters into the Else block.
Negative.append(NumList[1]) => Negative= [-34]

Third Iteration:for 2 in range(0, 5) –Condition is True
if(NumList[2] >= 0) => if(55 >= 0) – Condition is True
Positive.append(55) => Positive= [12, 55]

Fourth Iteration:for 3 in range(0, 5) –Condition is True
if(-87 >= 0) – Condition is False andit enters into Else block.
Negative.append(-87) => Negative= [-34, -87]

Fifth Iteration:for 4 in range(0, 5) – Condition is True
if(67 >= 0) – Condition is True
Positive.append(67) => Positive= [12, 55, 67]

Sixth Iteration:for 5 in range(5) – Condition is False.So it exits from Python For Loop

Python: Filter the positive numbers from a list

Last update on June 08 2021 14:26:54 (UTC/GMT +8 hours)

Python program to print positive or negative numbers in a list

Here, we are going to learn
different methods to find and print all positive or negative numbers in a list in Python.
Submitted by Shivang Yadav, on April 08, 2021

Python programming language is a high-level and object-oriented programming language. Python is an easy to learn, powerful high-level programming language. It has a simple but effective approach to object-oriented programming.

List is a sequence data type. It is mutable as its values in the list can be modified. It is a collection of ordered sets of values enclosed in square brackets
[].