A very cool feature of Python is that it allows for simultaneous assignment. The syntax is as follows:
var_name1, var_name2 = value1, value2
This can be useful as a shortcut for assigning several values at once, like this:
smart_1, cute_1, funny_1, quiet_1 = "John","Paul","Ringo","George"
But simultaneous assignment is really useful in a scenario like the one shown below.
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b=10
a=b
b=a
print("ATTEMPT 1. The Wrong Way.")
print(a)
print(b)
a=5
b=10
temp=a
a=b
b=temp
print("ATTEMPT 2. A Non-Pythonic Way that Works.")
print(a)
print(b)
a=5
b=10
a,b = b,a
print("ATTEMPT 3. The Python Way.")
print(a)
print(b)
The output should look like this:
The code demonstrates that simultaneous assignment really is simultaneous. The value for a
does not change before the value of b
, so b
gets the original value of a
, and we can switch the values without using an interim step of creating a temporary (and otherwise useless) variable.
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