When a syntax error is encountered in the program, the execution of the program is halted and Python interpreter displays an error message explaining the probable cause of the error. They commonly occur in your code due to a typo. Syntax errors happen when you don't follow the syntax rules.

The syntax is a set of rules to properly write a Computer language. Programming errors are mainly divided into three types: In programming errors are inescapable, sooner or later you will encounter one. You editor window will move into the background, Python Shell will become active and you will see the output of your from_idle.py program as follows: To run the program, Go to Run > Run Module or Hit F5. Save the file as from_idle.py in the Chapter-03 directory. However, if you are desperately looking for recommendation go for Sublime Text.Ĭreate a new file named hello.py inside Chapter-03 directory add the following code to it: To create programs you can use any text editor, just make sure to save your file as plain text.

Create another directory inside python101 named Chapter-03 to store the source files for this chapter. Then, use the Python interpreter in script mode to execute the code from a file.Ĭreate a new directory named python101, you can create this directory anywhere you want, just remember the location because we will use this directory to store all our programs throughout this course. In case, you want to execute same set of statements multiple times you would be better off to save the entire code in a file. Python Shell is great for testing small chunks of code but there is one problem - the statements you enter in the Python shell are not saved anywhere. To quit the Python shell in Windows hit Ctrl+Z followed by the Enter Key, On Linux or Mac hit Ctrl+D followed by Enter key. A program usually consists of sequence of statements. Statements are of different types as we will see.

A statement is simply a instruction for the Python interpreter to execute. In upcoming lessons we will discuss these concepts in great detail.Ĭommands such as 17 / 3, print('Big Python') are know as statements in programming. For example: 'olleh', 'print it' are strings but 1 and 3 are not.ĭon't worry, we are not expecting you understand these things at this point. In our case, the print() function prints the argument (i.e 'Big Python') it is given to the console.Ī string is just a sequence of string enclosed inside single or double quotes. Print() is a function - A function in programming is a chuck of code which does something very specific. We have just used two important programming constructs - A function and a string.

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