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I'm looking for an equivalent to sscanf() in Python. I want to parse /proc/net/* files, in C I could do something like this:
int matches = sscanf( buffer, "%*d: %64[0-9A-Fa-f]:%X %64[0-9A-Fa-f]:%X %*X %*X:%*X %*X:%*X %*X %*d %*d %ld %*512s\n", local_addr, &local_port, rem_addr, &rem_port, &inode); I thought at first to use str.split, however it doesn't split on the given characters, but the sep string as a whole:
>>> lines = open("/proc/net/dev").readlines() >>> for l in lines[2:]: >>> cols = l.split(string.whitespace + ":") >>> print len(cols) 1 Which should be returning 17, as explained above.
Is there a Python equivalent to sscanf (not RE), or a string splitting function in the standard library that splits on any of a range of characters that I'm not aware of?
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Your answerThere is nothing as such for python. For simple input parsing, the easiest way is usually to split the line into whitespace-delimited words using the split() method of string objects and then convert decimal strings to numeric values using int() or float().
Python does not currently have an equivalent to scanf(). Regular expressions are generally more powerful, though also more verbose, than scanf()format strings. The table below offers some more-or-less equivalent mappings between scanf() format tokens and regular expressions.
In python you have to use input() instead of scanf(). In python 2 you can use raw_input().
Reading input is handled differently in Python and C: Python uses the input function to read in a value as a string, and then the program converts the string value to an int , whereas C uses scanf to read in an int value and to store it at the location in memory of an int program variable (for example, &num1 ).
There is also the parse module.
parse() is designed to be the opposite of format() (the newer string formatting function in Python 2.6 and higher).
>>> from parse import parse >>> parse('{} fish', '1') >>> parse('{} fish', '1 fish') <Result ('1',) {}> >>> parse('{} fish', '2 fish') <Result ('2',) {}> >>> parse('{} fish', 'red fish') <Result ('red',) {}> >>> parse('{} fish', 'blue fish') <Result ('blue',) {}> If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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