Best performance of getting values of the dictionary in python

Question

Table = u'''A,This is A
B,This is B
C,This is C
D,This is D
E,This is E
F,This is F
G,This is G
H,This is H
I,This is I
J,This is J'''

SearchValue = u'''A
B
C
D
Bang
F
Bang
G
H'''

Table = Table.splitlines()
LineText = {}
for targetLineText in Table:
    LineText[targetLineText.split(',')[0]] = targetLineText.split(',')[1]

SearchValue = SearchValue.splitlines()
for targetValue in SearchValue:
    print LineText[targetValue] if targetValue in LineText else 'Error:' + targetValue

What this code is doing is... It finds value lists from the 'Table' dictionary by keys called 'SearchValue'

I check if the key exists by the following code..

targetValue in LineText

What I want to do to get the value at the same time of the key value existing check. Because I think that performs better.

Cédric Julien · Accepted Answer · 2012-02-16 11:09:19Z

2

you should take a look to the dict.get method :

SearchValue = SearchValue.splitlines()
for targetValue in SearchValue:
    print LineText.get(targetValue, 'Error:' + targetValue)

answered Feb 16, 2012 at 11:09

Cédric Julien

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Comments

Lauritz V. Thaulow · Accepted Answer · 2012-02-16 11:17:11Z

1

I've reformatted your code according to the python style guide and added some optimizations:

table = u'''A,This is A
B,This is B
C,This is C
D,This is D
E,This is E
F,This is F
G,This is G
H,This is H
I,This is I
J,This is J'''

search_value = u'''A
B
C
D
Bang
F
Bang
G
H'''

line_text = dict(line.split(",") for line in table.splitlines())

for target_value in search_value.splitlines():
    print line_text.get(target_value, "Error: {0}".format(target_value))

answered Feb 16, 2012 at 11:17

Lauritz V. Thaulow

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1 Comment

Nigiri Over a year ago

SO NICE!! THANK YOU SO MUCH!! I gotta know about the python style

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