Writing Parsers in Python Using Pyparsing
[Pages:21]Writing Parsers in Python Using Pyparsing
Paul McGuire APUG ? May, 2016
Best practices: ... highlighted in the examples
integer = Word('0123456789') phone_number = Optional('(' + integer + ')') + integer + '-' + integer
# pile(r'(\(\d+\))?\d+-\d+')
greet = Word(alphas) + "," + Word(alphas) + "!" greet.parseString("Hello, World!")
Best practice: Don't include whitespace in the parser definition
geo:27.9878,86.9250,8850;crs=wgs84;u=100 geo:-26.416,27.428,-3900;u=100 geo:17.75,142.5,-11033;crs=wgs84;u=100 geo:36.246944,-116.816944,-85;u=50 geo:30.2644663,-97.7841169;a=100;href=
geo-URI geo-scheme geo-path coordinates
= geo-scheme ":" geo-path = "geo" = coordinates p = num "," num [ "," num ]
p crsp crslabel uncp
other val
= [ crsp ] [ uncp ] [";" other]...
= ";crs=" crslabel
= "wgs84" / labeltext = ";u=" uval
Best practice: Start with a BNF
= labeltext "=" val = uval / chartext
ParseResult(scheme='geo', netloc='', path='27.9878,86.9250,8850;crs=wgs84;u=100', params='', query='', fragment='')
patt = r'geo:(-?\d+(?:\.\d*)?),(-?\d+(?:\.\d*)?)(?:,(-?\d+(?:\.\d*)?))?' + r'(?:;(crs=[^;]+))?(?:;(u=\d+(?:\.\d*)?))?'
print(pile(patt).match(tests[0]).groups()) ('27.9878', '86.9250', '8850', 'crs=wgs84', 'u=100')
................
................
In order to avoid copyright disputes, this page is only a partial summary.
To fulfill the demand for quickly locating and searching documents.
It is intelligent file search solution for home and business.
Related download
- cpsc 311 2010w1 midterm exam 1 ubc csss
- beautiful soup documentation — beautiful soup v4 0 0
- argh documentation read the docs
- reading and writing xml from python
- syntax and parsing columbia university
- mining input grammars from dynamic control flow
- cis192 python programming
- disciplined convex programming and cvx
- 1 learning to use python regular expressions
- lexical analysis github pages
Related searches
- join in python using on
- create a matrix in python using for
- update python using pip
- integration in python using numpy
- python using and in if statement
- recursive function in list python using recursion
- upgrade python using pip
- python using matplotlib
- python using pip
- install python using command prompt
- for loop in python using range
- python using datetime