Parse string into different types

Question

I have looked at this solution but my requirements are slightly different.

I have a string of the form: "command int1 int2", e.g. "download 600 10".

I know I could use str.split(" ") to break the string into its component parts but then I would have to convert the 2nd and 3rd parameters to ints. Thus the following won't work (the int cast fails when it encounters "download" in the string):

(cmd, int1, int2) = [int(s) for s in file.split(' ')]

I'm still pretty new to Python... so I'm wondering if there is a nice, pythonic way to accomplish my goal?

Open AI - Opting Out · Accepted Answer · 2017-05-14 14:06:13Z

5

You could maps types to values:

>>> types = (str, int, int)
>>> string = 'download 600 10'
>>> cmd, int1, int2 = [type(value) for type, value in zip(types, string.split())]

>>> cmd, int1, int2
('download', 600, 10)

answered May 14, 2017 at 14:06

Open AI - Opting Out

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2 Comments

Open AI - Opting Out Over a year ago

No problem, enjoy.

RobertJoseph Over a year ago

def strToTypes(string, types_tuple):     array = [type(value) for type, value in zip(types_tuple, string.split())]     return array  noun, n1, n2 = strToTypes("noun 3 4", (str, int, float)) print(noun, n1, n2)

javidcf · Accepted Answer · 2017-05-14 13:50:03Z

1

It depends on your take on what "pythonic" means to you, but here's another way:

words = file.split(" ")
cmd, (int1, int2) = words[0], map(int, words[1:])

answered May 14, 2017 at 13:50

javidcf

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Comments

Horia Coman · Accepted Answer · 2017-05-14 13:52:44Z

1

There isn't anything more Pythonic in the standard library. I suggest you just do something simple such as:

cmd = file.split(' ')
command = cmd[0]
arg1 = int(cmd[1])
arg2 = int(cmd[2])

You could always try to look for a little parser, but that would be overkill.

answered May 14, 2017 at 13:52

Horia Coman

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Community · Accepted Answer · 2017-05-23 12:18:01Z

1

From here I have imported the following function, which use isdigit() (see here):

def check_int(s): # check if s is a positive or negative integer
    if s[0] in ('-', '+'):
        return s[1:].isdigit()
    return s.isdigit()

Then you need only this code:

your_string = "download 600 10" 
elements = your_string.split(" ")
goal = [int(x) for x in elements if check_int(x)]

cmd, (int1,int2) = elements[0], goal

edited May 23, 2017 at 12:18

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answered May 14, 2017 at 13:59

titiro89

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Comments

Abdullah Danyal · Accepted Answer · 2017-05-14 14:06:59Z

0

You can do it like this.

file = "downlaod 600 10"
file_list = file.split(' ')
for i in range(len(file_list)):
 try:
   file_list[i] = int(file_list[i])
 except ValueError:
    pass    
(cmd, int1, int2) = file_list

answered May 14, 2017 at 14:06

Abdullah Danyal

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