python append value to dictionary list
import collections
a_dict = collections.defaultdict(list) # a dictionary key --> list (of any stuff)
a_dict["a"].append("hello")
print(a_dict)
>>> defaultdict(<class 'list'>, {'a': ['hello']})
a_dict["a"].append("kite")
print(a_dict)
>>> defaultdict(<class 'list'>, {'a': ['hello', 'kite']})append in dictionary with matrix values
import numpy as np
a = np.mat('4 3; 2 1')
b = np.mat('1 2; 3 4')
print(a)
# [[4 3]
# [2 1]]
print(b)
# [[1 2]
# [3 4]]
print(a*b)
# [[13 20]
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