Python from tuples to strings

Question

new to the python programming, havin some difficulties figuring this out. I'm trying to convert tuples into strings, for example ('h','e',4) into 'he4'. i've submitted a version using the .join function, and i'm required to come up with another ver. i'm given the following:

def filter(pred, seq): # keeps elements that satisfy predicate
    if seq == ():
        return ()
    elif pred(seq[0]):
        return (seq[0],) + filter(pred, seq[1:])
    else:
        return filter(pred, seq[1:])

def accumulate(fn, initial, seq):
    if seq == ():
        return initial
    else:
        return fn(seq[0],  accumulate(fn, initial, seq[1:]))

hints on how to use the following to come up with conversion of tuples to strings?

Possible duplicate of Python convert tuple to string

Brandon Kheang
– Brandon Kheang

2017-09-21 02:13:54 +00:00
Commented Sep 21, 2017 at 2:13 — Brandon Kheang
– Brandon Kheang, Commented Sep 21, 2017 at 2:13
@BrandonKheang Nothing there uses the above two functions.

Stefan Pochmann
– Stefan Pochmann

2017-09-21 02:14:22 +00:00
Commented Sep 21, 2017 at 2:14 — Stefan Pochmann
– Stefan Pochmann, Commented Sep 21, 2017 at 2:14
"the following"?

Stefan Pochmann
– Stefan Pochmann

2017-09-21 02:17:06 +00:00
Commented Sep 21, 2017 at 2:17 — Stefan Pochmann
– Stefan Pochmann, Commented Sep 21, 2017 at 2:17

Stefan Pochmann · Accepted Answer · 2017-09-21 02:21:35Z

1

The given filter is useless for this but the given accumulate can be used easily:

>>> t = ('h','e',4)
>>> accumulate(lambda x, s: str(x) + s, '', t)
'he4'

answered Sep 21, 2017 at 2:21

Stefan Pochmann

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1 Comment

Chin Huat Over a year ago

may i know what does str(x) + s means?

Kaushik NP · Accepted Answer · 2017-09-21 02:12:36Z

0

Just loop through the tuple.

#tup stores your tuple
string = ''
for s in tuple :
    string+=s

Here you are going through the tuple and adding each element of it into a new string.

edited Sep 21, 2017 at 2:12

answered Sep 21, 2017 at 2:11

Kaushik NP

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4 Comments

Davy M Over a year ago

I think the OP is required to use those funny looking functions, otherwise you're right this would be a very simple solution

Kaushik NP Over a year ago

Hmmm. Might be. Why complicate it when you can keep it simple I say. But yes, if that's the requirement, will looking into it.

Kaushik NP Over a year ago

Though @Davy M , the function the OP provides seems weird. Can you make out what that looks like?

Davy M Over a year ago

I really can't haha

mshsayem · Accepted Answer · 2017-09-21 02:25:52Z

0

1) Use reduce function:

>>> t = ('h','e',4)
>>> reduce(lambda x,y: str(x)+str(y), t, '')
'he4'

2) Use foolish recursion:

>>> def str_by_recursion(t,s=''):
        if not t: return ''
        return str(t[0]) + str_by_recursion(t[1:])

>>> str_by_recursion(t)
'he4'

edited Sep 21, 2017 at 2:25

answered Sep 21, 2017 at 2:15

mshsayem

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Comments

FELASNIPER · Accepted Answer · 2017-09-21 02:14:50Z

-1

You can use map to and join.

tup = ('h','e',4)
map_str = map(str, tup)
print(''.join(map_str))

Map takes two arguments. First argument is the function which has to be used for each element of the list. Second argument is the iterable.

answered Sep 21, 2017 at 2:14

FELASNIPER

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