IMPROVE: in 100+ Python challenging programming exercises for Python 3.md in line 573

def putNumbers(n):
i = 0
while i<n:
j=i
i=i+1
if j%7==0:
yield j
for i in reverse(100):
print(i)

we can improve by initalise
n = int(input())
def putNumbers(n):
i = 0
while i<n:
j=i
i=i+1
if j%7==0:
yield j
for i in reverse(n):
print(i)