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Repetition - while statement
Calculate the sum of numbers from 1 to 10. 
n=1
t=0
while n<=10:
    ......
    ......
print(t)
Calculate the sum of odd numbers from 1 to 10. 
n=1
t=0
while n<=10:
    if ......:
        t+=......
    n+=1
print(t)
Calculate the sum of even numbers from a user given range. 
start=int(input('Enter start number: '))
stop=int(input('Enter stop number: '))
t=0
n=start
while .......:
    if n%2==0:
        ......
    n+=1
print('Sum of even numbers from '+str(start)+' to '+str(stop)+' is '+str(t))
Input a series of numbers (one at a time) ending with -99 and output the sum of positive odd numbers. 
t=0
num=int(input('Enter a number: '))
while num!=-99:
    if ...... and ......:
        t+=num
    num=int(input('Enter a number: '))
print(t)
Input a series of numbers (one at a time) ending with -99 and output all negative numbers as a list (except -99). 
nlist=[]
num=int(input('Enter a number: '))
while num!=-99:
    if ........:
        nlist.append(......)
    num=int(input('Enter a number: '))
print(nlist)
Input a series of numbers (one at a time) ending with -99 and output the average of positive numbers. 
t=0
c=0
num=int(input('Enter a number: '))
while num!=-99:
    if num>0:
        t+=.....
        c+=.....
    num=int(input('Enter a number: '))
avg=......
print(avg)
Input n number of numbers (one at a time) and output the sum of positive even numbers. 
t=0
c=0
n=int(input('How many numbers: '))
while c<n:
    num=int(input('Enter a number: '))
    if num>0 and ........:
        t+=......
    c+=.....
print(t)