Mastering Python Networking

Python control flow tools

The if, else, and elif statements control conditional code execution. As one would expect, the format of the conditional statement is as follows:

    if expression:      do something    elif expression:      do something if the expression meets    elif expression:      do something if the expression meets    ...    else:      statement

Here is a simple example:

    >>> a = 10    >>> if a > 1:    ...   print("a is larger than 1")    ... elif a < 1:    ...   print("a is smaller than 1")    ... else:    ...   print("a is equal to 1")    ...    a is larger than 1    >>>

The while loop will continue to execute until the condition is false, so be careful with this one if you don't want to continue to execute:

    while expression:      do something

    >>> a = 10    >>> b = 1    >>> while b < a: ... print(b) ...