How do YOU copy your dicts?

gistfile1.txt

import timeit
import copy
from statistics import median, mean, stdev
 
 
def dictcopy1(): 
    a = {'one': 1, 'two': 2, 'three': 3}
    b = dict(a)
    return b


def dictcopy2(): 
    a = {'one': 1, 'two': 2, 'three': 3}
    b = a.copy() 
    return b


def dictcopy3():
    a = {'one': 1, 'two': 2, 'three': 3}
    b = copy.copy(a)
    return b

 
dicta = timeit.repeat("dictcopy1()", "from __main__ import dictcopy1",
                      repeat=100)
acopy = timeit.repeat("dictcopy2()", "from __main__ import dictcopy2",
                      repeat=100)
ccopy = timeit.repeat("dictcopy3()", "from __main__ import dictcopy3",
                      repeat=100)


print('\n', '*'*100)
print('b = dict(a)')
print('*'*100, '\n')
print('Median: ', median(dicta))
print('Mean: ', mean(dicta))
print('Sample StdDev: ', stdev(dicta))  # generalize population from sample

print('\n', '*'*100)
print('b = a.copy()')
print('*'*100, '\n')
print('Median: ', median(acopy))
print('Mean: ', mean(acopy))
print('Sample StdDev: ', stdev(acopy))  # generalize population from sample

print('\n', '*'*100)
print('b = copy.copy(a)')
print('*'*100, '\n')
print('Median: ', median(ccopy))
print('Mean: ', mean(ccopy))
print('Sample StdDev: ', stdev(ccopy))  # generalize population from sample


Results:
----------------------------------------------------------------------------------------------------------

****************************************************************************************************
b = dict(a)
**************************************************************************************************** 

Median:  0.42619629399996484
Mean:  0.4278273579900997
Sample StdDev:  0.006185062704368336

****************************************************************************************************
b = a.copy()
**************************************************************************************************** 

Median:  0.30548073149839183
Mean:  0.306699450550077
Sample StdDev:  0.004233703615272607

 ****************************************************************************************************
b = copy.copy(a)
**************************************************************************************************** 

Median:  0.8034708440027316
Mean:  0.8066223032602283
Sample StdDev:  0.00855569898601049