How to iterate a list over re.sub and replace variables in a string using python?

Question

I have a string say:

s = 'deviceId={servicename.DeviceID}&deviceGroupID={servicename.GroupID}&abcd=dkef'

I could get the data by parsing several XMLs for the items in Parentheses. After obtaining the data, I use dictset's combinator to yield these results(roughly) for the items in parantheses {} :

['ApplC3LDJXGEDCP7', '10']
['ApplC3LDJXGEDCP7', '11']
['ApplC3LDJXGEDCP7', '12']
['ApplC3LDJXGEDCP7', '13']
['androidc1596699510', '14']

Dictset combinations return a list of items [deviceId, groupID]. Considering that I am a newbie to Python, how do I iterate over this list and find/replace items in the string? Please help!

Let me also add what I have tried so far- I could iterate over the list using For and able to replace 1 item from the list using re.sub. However the code needs both the items to be replaced at once. The regex i use is r"{.+?}"

Let me also add what I have tried so far- I could iterate over the list using For and able to replace 1 item from the list using re.sub. However the code needs both the items to be replaced at once. The regex i use is r"\{.+?\}" — sunnysideup
– sunnysideup, Commented Aug 17, 2011 at 4:13
There is practically the same question asked minutes after: stackoverflow.com/questions/7087905/… — hamstergene
– hamstergene, Commented Aug 17, 2011 at 4:57
hi Eugene, the response uses a dictionary key to iterate. Unfortunately I am unable to add a key to the result given that the result is a list. Let me try, but am not sure whether it will yield results. — sunnysideup
– sunnysideup, Commented Aug 17, 2011 at 5:15

hamstergene · Accepted Answer · 2011-08-17 05:16:24Z

3

Use single sub call and pass a function that returns what you need.

s = 'deviceId={servicename.DeviceID}&deviceGroupID={servicename.GroupID}&abcd=dkef'
r = ['ApplC3LDJXGEDCP7', '10']
print(re.sub(r'{.+?}', lambda match: r.pop(0), s, count=len(r)))
# deviceId=ApplC3LDJXGEDCP7&deviceGroupID=10&abcd=dkef

A better approach may be to use urllib.parse.parse_qs, that will tolerate parameter reordering, missing parameters, etc.

answered Aug 17, 2011 at 5:16

hamstergene

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