while i<10:
a = a + i
print (a)
i = i+1
or
for i in range(10):
sum = sum + i
print
0
1
3
6
10
15
21
28
36
45
Then how can I add them together by writing further codes? I mean 1+3+6+10+15+21+... Then set the total as variables! That would be great if you can show me in both loop :)
How about this:
total, totaltotal = 0, 0
for i in range(10):
total += i
totaltotal += total
print total, totaltotal
Alternatively, you can make a list of the totals and store them to operate on separately:
total, totals = 0, []
for i in range(10):
total += i
totals.append(total)
print total
totaltotal = 0
for i in range(10):
totaltotal += totals[i]
print totaltotal
You may want to rewrite this as a list comprehension (or even a generator expression), as a useful exercise.
How about
sum(sum(i + 1 for i in range(n)) for n in range(10))
(if you want a pythonic approach)
In [26]: summ=0
In [27]: foo=0
In [28]: for i in range(10):
sum+=i #add i to summ
foo+=sum #add summ to foo
....:
....:
In [31]: sum
Out[31]: 45
In [32]: foo
Out[32]: 165
or a one-liner:
In [58]: sum(map(sum,map(range,range(1,11))))
Out[58]: 165
timeit comparisons:
In [56]: %timeit sum(sum(i + 1 for i in range(n)) for n in range(1000))
10 loops, best of 3: 128 ms per loop
In [57]: %timeit sum(map(sum,map(range,range(1,1001))))
10 loops, best of 3: 27.4 ms per loop
help(sum)at the interpreter console, because it may help you here.)