Common errors and try-except usage in Python

1. Common Mistakes

We will appear in the process of using Python:

(1) SyntaxError syntax error.

(2) Indentationerror indentation error.

(3) nameerror variable undefined error.

(4) TypeError type error.

2. Handling Exceptions

We use Try...except to handle exceptions:

Basic syntax:

Try

Segment

Except

Segment

Executes the TRY clause first, and if no exception occurs, the EXCEPT clause does not execute. If an exception occurs executing a try clause, the clause is ignored and the corresponding except clause is executed if the exception matches the specified exception type after the except keyword. Then continue executing the code after the try statement.

If the corresponding processing statement is not found, the program terminates.

Def get_number ():    "Returns a float number"    number=float (Input ("Enter a float Number:"))    return Numberwhile True:    Try:        print (Get_number ())    except ValueError:        print ("You entered a wrong value.")

When we enter a floating-point number, the floating-point number is output. When we enter a letter, throw ValueError, when we press CTRL + C, causing keyboardinterrupt, this exception is not captured in except, so the program is terminated.

Common errors and try-except usage in Python