python uses while to find the sum of integers within 100

Directory 1, 1 to 100 and 2, even numbers in 1 to 100 and odd numbers in 3, 1 to 100

The sum of 1, 1 to 100

Define 2 variables i and sum The initial values are all 1, the value of i is increased by 1 every time, and the program is finished after taking 100. sum Is equal to itself plus the value of i. Thus i is fetched from 2 to 100 and added to sum each time.

#!/usr/bin/env python
#-*- coding:utf-8 -*-
i=1
sum=1
while True:
    i+=1
    sum=sum+i
    if i==100:
        break
print(sum)

2, even sums from 1 to 100

Method 1: Same as above, except that the initial values of i and sum are 0, and the values of i are increased by 2 every time, and the program ends after taking 100.

#!/usr/bin/env python
#-*- coding:utf-8 -*-
i=0
sum=0
while True:
    i+=2
    sum=sum+i
    if i==100:
        break
print(sum)

Method 2: Make num% 2 by taking the cofunction%, and if it is equal to 0, it is even, sum=sum+num

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# Python Learning and communication group: 778463939
num=0
sum=0
while True:
    num+=1
    if num%2==0:
        sum=sum+num
    if num==100:
        break
print("Task finished!The sum of even numbers from 1 to 100 is:  "+str(sum))

Little knowledge: The equal sign is = =, which can no longer be written as num% 2=0.

3, odd sums from 1 to 100

Method 1: Same as above, except that the initial value of i and sum is 1, and the value of i is increased by 2 every time. The value of i, which needs special attention here, ends after 99, otherwise the program is dead loop.

#!/usr/bin/env python
#-*- coding:utf-8 -*-
i=int(1)
sum=int(1)
while True:
    i+=2
    sum=sum+i
    if i==99:
        break
print(sum)

Method 2: Make num% 2 by taking the cofunction%, and if it is equal to 1, it is odd, sum=sum+num

#!/usr/bin/env python
# -*- coding:utf-8 -*-
num=0
sum=0
while True:
    num+=1
    if num%2==1:
        sum=sum+num
    if num==100:
        break
print("Task finished!The sum of odd numbers from 1 to 100 is:  "+str(sum))