Fetching values from a list in Python-CodePudding


values = ['random word1', 20, 'random word2', 54]

values = list(map(list,zip(values[::2], values[1::2])))

print(values)

[['random word1', 20], ['random word2', 54]]

Now I want to fetch values like this:

if ‘random word2’ in values:

get the value associated with random word 2 which is in this case 54.

Note: string words and values are random.

How can I do that?

I need to fetch the correct value.

CodePudding user response：

I think a dictionary over a list is the way to go

d = dict(zip(values[::2], values[1::2]))
print(d['random word1'])  # -> 20

CodePudding user response：

try:
    value = values[values.index("random words2")   1]
except ValueError:
    value = None

Or, if you need to fecth more values, convert your list to a dictionary and then use the get method. Even for 2 retrievals this will already be more efficient, algorithmically wise:

# make N 2-tuples treating the odd-positioned elements as keys and 
# even ones as values, and call the dict constructor with that:
v = dict([i:i 2] for i in range(0, len(values), 2))
v.get("random word2")