You can see the error when we try to import it. If you try to import such packages without installing them first you would get an error called 'ModuleNotFoundError'.įor example, Backtrader is a Python package used for live trading and backtesting trading strategies.
But what about the packages that do not come along with Python installation?
Python has certain in-built packages which are installed along with the installation of Python. Also, the use of dots in the module titles saves the author of multi-module packages from having to worry about each other’s module names. Packaging the modules in such a way saves the author of different modules from having to worry about each other’s global variable names. It is a way of structuring Python’s module namespace by using "dotted module names".įor example, the module name “matplotlib.pyplot” designates a submodule named “pyplot” in a package named “matplotlib”. Packages are nothing but a collection of modules. The definitions from a module can be imported into other modules or in the program that we code. To support this, Python has a way to put a code definition in a file and use them in any Python script (code lines). Also, we can find a way to copy and paste the lines of code each time we wish to use the same, without having to create the code lines every time we want the same program. This is known as writing a script.Īs a program gets longer, we may want to split it into several small files for easier maintenance. In order to write a long program, we might consider a text editor to write the Python code lines. When we write Python code lines for a particular task, for instance, trade order execution or for entering a trade signal (buy or sell), we use the Python environment such as the Python or IPython console.
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