Nahrazení hodnot pomocí seznamů

Psaní efektivního kódu s pandas

Leonidas Souliotis

PhD Candidate

Nahrazení více hodnot jednou hodnotou

Year of Birth	Gender	Ethnicity	Child's First Name	Count	Rank
2011	FEMALE	WHITE NON HISP	HELENA	97	4

start_time = time.time()
names['Ethnicity'].loc[(names["Ethnicity"] == 'WHITE NON HISPANIC') | 
(names["Ethnicity"] == 'WHITE NON HISP')] = 'WNH'
print("Results from the above operation calculated in %s seconds" %
 (time.time() - start_time))

Results from the second method calculated in 0.0276169776917 seconds

Nahrazení více hodnot pomocí .replace() I

start_time = time.time()
names['Ethnicity'].replace(['WHITE NON HISPANIC','WHITE NON HISP'],
'WNH', inplace=True)
print("Time using .replace(): {} sec".format(time.time() - start_time))

Time using .replace():  0.00144791603088 sec

Difference in speed: 2160.68681809%

names['Ethnicity'].replace(['WHITE NON HISP'], 'WHITE NON HISPANIC', inplace=True)
names['Ethnicity'].replace(['BLACK NON HISP'], 'BLACK NON HISPANIC', inplace=True)

names['Ethnicity'].replace(['BLACK NON HISP','WHITE NON HISP'], ['BLACK NON HISPANIC',
'WHITE NON HISPANIC'], inplace=True)

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Psaní efektivního kódu s pandas