Split string by count of characters

Question

I can\'t figure out how to do this with string methods:

In my file I have something like 1.012345e0070.123414e-004-0.1234567891.21423... which means there is no deli

Answer 1

line = "1.012345e0070.123414e-004-0.1234567891.21423"
firstNumber = line[:12]
restOfLine = line[12:]

print firstNumber
print restOfLine

Output:

1.012345e007
0.123414e-004-0.1234567891.21423

Answer 2

Try this function:

x = "1.012345e0070.123414e-004-0.1234567891.21423"
while len(x)>0:
  v = x[:12]
  print v
  x = x[12:]

Answer 3

Since you want to iterate in an unusual way, a generator is a good way to abstract that:

def chunks(s, n):
    """Produce `n`-character chunks from `s`."""
    for start in range(0, len(s), n):
        yield s[start:start+n]

nums = "1.012345e0070.123414e-004-0.1234567891.21423"
for chunk in chunks(nums, 12):
    print chunk

produces:

1.012345e007
0.123414e-00
4-0.12345678
91.21423

(which doesn't look right, but those are the 12-char chunks)

Answer 4

You're looking for string slicing.

>>> x = "1.012345e0070.123414e-004-0.1234567891.21423"
>>> x[2:10]
'012345e0'

Answer 5

you can do it like this:

step = 12
for i in range(0, len(string), 12):
    slice = string[i:step]
    step += 12

in this way on each iteration you will get one slice of 14 characters.

Answer 6

I stumbled on this while looking for a solution for a similar problem - but in my case I wanted to split string into chunks of differing lengths. Eventually I solved it with RE

In [13]: import re

In [14]: random_val = '07eb8010e539e2621cb100e4f33a2ff9'

In [15]: dashmap=(8, 4, 4, 4, 12)

In [16]: re.findall(''.join('(\S{{{}}})'.format(l) for l in dashmap), random_val)
Out[16]: [('07eb8010', 'e539', 'e262', '1cb1', '00e4f33a2ff9')]

Bonus

For those who may find it interesting - I tried to create pseudo-random ID by specific rules, so this code is actually part of the following function

import re, time, random 
def random_id_from_time_hash(dashmap=(8, 4, 4, 4, 12)):
     random_val = ''
     while len(random_val) < sum(dashmap):
         random_val += '{:016x}'.format(hash(time.time() * random.randint(1, 1000)))
     return '-'.join(re.findall(''.join('(\S{{{}}})'.format(l) for l in dashmap), random_val)[0])