I got some programs that i need help with and it would be awesome if someone can help me out with them. I've been lurking around this site and hopefully someone can help me. Thank you

I m writing a program that should take number n and output it's sum of it.

for example if i enter 5 it should output 55

1^2+2^2+3^2+4^2+5^2=55

for far i m getting nothing.. a error of 15.. its adding up the numbers but not ^2 them.

```
def times(y):
sum=0
for i in range(1,y+1):
sum+=i
return sum
def main():
x=input("Enter a number")
w=times(x)
print w
main()
```

Problem 2

this program is asking for numbers into words.. so far i got this

```
import string
def letters(l):
a=str(l)
def main():
x=raw_input("Enter some numbers to be written out")
mylist=[]
sentinel="*"
while (x!=sentinel):
y=eval(x)
mylist.append(y)
x=raw_input("Enter some numbers to be written out")
z=letters(mylist)
print z
main()
```

but in the program letters.. i was going to put in the if statements like this ..

```
if x==10:
print "ten"
if x==9:
numnine=x
print "nine"
if x==8:
numeight=x
print "eight"
if x==7:
numseven=x
print "seven"
if x==6:
numsix=x
print "six"
```

but the thing is .. it has to go up to 999 i can write out all the numbers which will take me a whole day but there is got to be a shorter way of doing it

problem 3

i got to write this program in a recursively way.. where when i enter numbers in a list it should print out the reverse list in a exact way not using built in fuction.. i got it to work using reverse fuction but thats built in ..and i got it to print reverse but its sorting it..

here is the sorting way

```
import string
def reverse(L):
m=len(L)
for i in range(m-2):
for j in range(m-1):
if L[j]<L[j+1]:
L[j],L[j+1]=L[j+1],L[j]
def main():
x=raw_input("Enter numbers to reverse it")
mylist=[]
sentinel="*"
while (x!=sentinel):
y=eval(x)
mylist.append(y)
x=raw_input("Enter numbers to reverse it")
w=reverse(mylist)
print w
main()
```

well it was sorting but now its print none

lastly

how do i get started with a program to write the A-Z and returns its permutations ..

for example.. write ab.. it prints ab, ba, if i enter abc it print abc bca cab acb n etc

if anyone can help me with this.. .that would be awesome... thank you!!!