Parsing key values in a string
I have a string that I am getting from a command line application. It has the following structure:
-- section1 --
item11|value11
item12|value12
item13
-- section2 --
item21|value21
item22
what I would like is to parse this into a dict so that I can easily access the values with:
d['section1']['item11']
I've already solved this for the case where there are no partitions and each key has a value, but otherwise I get errors. I've tried a couple of things, but it gets complicated because nothing works either. This is what I have now:
s="""
item11|value11
item12|value12
item21|value21
"""
d = {}
for l in s.split('\n'):
print(l, l.split('|'))
if l != '':
d[l.split('|')[0]] = l.split('|')[1]
Can someone help me expand this for the case of a section and when there are no values?
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2 answers
Seems like a perfect fit for the ConfigParser module in the standard library:
d = ConfigParser(delimiters='|', allow_no_value=True)
d.SECTCRE = re.compile(r"-- *(?P<header>[^]]+?) *--") # sections regex
d.read_string(s)
You now have an object that you can access like a dictionary:
>>> d['section1']['item11']
'value11'
>>> d['section2']['item22'] # no value case
None
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Regexes is a good result:
import re
def parse(data):
lines = data.split("\n") #split input into lines
result = {}
current_header = ""
for line in lines:
if line: #if the line isn't empty
#tries to match anything between double dashes:
match = re.match(r"^-- (.*) --$", line)
if match: #true when the above pattern matches
#grabs the part inside parentheses:
current_header = match.group(1)
else:
#key = 1st element, value = 2nd element:
key, value = line.split("|")
#tries to get the section, defaults to empty section:
section = result.get(current_header, {})
section[key] = value #adds data to section
result[current_header] = section #updates section into result
return result #done.
print parse("""
-- section1 --
item1|value1
item2|value2
-- section2 --
item1|valueA
item2|valueB""")
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