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# variables are dynamically typed
x = 3
x = "three" # ok in Python
x = [1, 2, 3] # x is a list
y = x # both x and y refer to the same list
y.append(4) # appending to y impacts x as well
print(x)
s = "three"
# call upper, a member method of the string object
t = s.upper()
print(t)
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