Python: Comparing dictionary key with string

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Python dictionnaries have keys and values accessed using those keys.

You can access the keys as follows, your dict key will be stored in the key variable:

my_dict = {"a" : 1, "b" : 2}
for key in my_dict:
    print key

This will print:

a
b

You can then do any comparisons you want:

my_dict = {"a" : 1, "b" : 2}
for key in my_dict:
    if key == "a":
        return True
    else:
        return False

which can be improved to:

my_dict = {"a" : 1, "b" : 2}
print "a" in my_dict.keys()

You can then access the values for each key in your dict as follows:

my_dict = {"a" : 1, "b" : 2}
for key in my_dict:
    print my_dict[key]

This will print:

1
2

I suggest you read more about dictionaries from the official Python documentation: https://docs.python.org/3.6/tutorial/datastructures.html#dictionaries

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ScandinavianWays
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ScandinavianWays

Updated on June 05, 2022

Comments

  • ScandinavianWays
    ScandinavianWays 3 months

    I'm trying to compare the key in a dictionary with a string in Python but I can't find any way of doing this. Let's say I have:

    dict = {"a" : 1, "b" : 2}
    

    And I want to compare the key of the first index in the dictionary (which is "a") with with a string. So something like:

    if ´Dictionary key´ == "a":
        return True
    else:
        return False
    

    Is there a way of doing this? Appreciate all the help I can get.