How I can print the numbers from 1-9999?

Question

I tried it on here but it can not print the long numbers like this

for i in range(1,222222222222222):
    print i

Error:

Traceback (most recent call last):
  File "x.py", line 1, in <module>
    for i in range(1,222222222222222):
MemoryError

Answer 1

Use xrange.

for i in xrange(1, 222222222222222):
    print i

This function is very similar to range(), but returns an “xrange object” instead of a list. This is an opaque sequence type which yields the same values as the corresponding list, without actually storing them all simultaneously.

Answer 2

You are probably using Python2, where range() produces a list of numbers. A list with 222222222222222 elements is quite large, too large for most RAMs.

In contrast to this, xrange() produces an xrange object which can be accessed like a list (indexed, iterated), but doesn't occupy as much space because the values are computed on-demand.

In Python3, range() returns a range object which is quite the same as the xrange object in 2.x.

Answer 3

Use xrange instead of range. range generates a list, stores it in the memory and performs the loop on each item. This generates memory errors when dealing with quite big numbers.

xrange is a generator not a list, items are created on the fly, so it does not harm for the memory

I hope this helps

Answer 4

Use xrange instead. The range function actually constructs the list in memory, while xrange returns a generator (similar to an iterator), and returns only one number at a time.

for i in xrange(1,222222222222222L):
    print i

See more on the topic here

Answer 5

Python creates the range before you start the loop, resulting in a huge amount of memory use/oom error.

you're better off using xrange, it allocates the range in smaller pieces.

for i in xrange(from, to):
    print i

Answer 6

you can also create generator using yield on your own:

def my_gen(start, end, step):
    while start < end:
        start += step
        yield start

for x in my_gen(1, 1000, 2):
    print x

Answer 7

Check this example of While Loop

a = 0
while a < 10 :
    a += 1
    print (a)

You can also do the same using "For Loop"

onetoten = range(1,11)
for count in onetoten:
    print (count)