Learning how to read and understand error messages can save a lot of time and trouble once you know what to look for.
One of the most common errors is the syntax error, which indicates that you have written a line of code that does not follow the rules of Python’s grammar. Here is an example of a syntax error that is due to a missing colon (:) at the end of the function definition line def foo(x, y). It is also very common to get a syntax error like this when you are using an if statement.
Another common error is to use a variable that has not yet been assigned a value. The following example shows an attempt ...
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