Describing Code

Programs can be quite complicated and are often thousands of lines long. It can be helpful to write a comment describing parts of the code so that when you or someone else reads it, the meaning is clear.

In Python, any time the # character is encountered, Python will ignore the rest of the line. Comments allow you to write English sentences (or, for that matter, sentences in any language):

​	​>>>​​ ​​# Python ignores this sentence because of the # symbol.​

The # symbol does not have to be the first character on the line; it can appear at the end of a statement:

​	​>>>​​ ​​(212​​ ​​-​​ ​​32)​​ ​​*​​ ​​5​​ ​​/​​ ​​9​​ ​​# Convert 212 degrees Fahrenheit to Celsius.​
​	100.0

Notice that the comment doesn’t describe how Python works. It is meant for humans reading the code to help them understand why the code exists.

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