How do I substitute a variable in Python Script Mongodb

Question

I am trying to substitute the "value" in the below snippet using a variable value but no luck.

last_error = posts.update(
    {'permalink':permalink}, 
    { '$inc': 
        { 'comments."value".num_likes': 1 }
    }, 
    upsert=False, 
    manipulate=False, safe=True
)

The variable holds values like 0,1,2,3 etc and needs to update an array based on the array position (Here the array position is determined by the array value).

Not sure how to pass the variable value to the update command. I tried things like {value} ...[value] between the comments and numlikes. Nothing worked.

mVChr · Accepted Answer · 2012-12-14 19:29:08Z

1

Can't you just concatenate it to the string?

last_error = posts.update(
    {'permalink':permalink},
    {'$inc': {'comments.' + str(value) + '.num_likes': 1}},
    upsert=False,
    manipulate=False,
    safe=True)

And here are two other ways to write line 3 above for good measure:

    {'$inc': {'comments.%s.num_likes' % value: 1}},

or:

    {'$inc': {'comments.{value}.num_likes'.format(value=value): 1}},

edited Dec 14, 2012 at 19:29

answered Dec 14, 2012 at 19:17

mVChr

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1 Comment

user1904858 Over a year ago

Today is my third day learning python. Interesting stuff and appreciate your help.

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