The Closest Bars

The code reads a file with arbitrary data in JSON format and provides the following info: • the largest bar; • the smallest bar; • The closest bar (the current gps coordinates are entered by the user from the keyboard).

Quickstart

The program is represented by the module bars.py. Module bars.py contains the following functions:

• load_data() - open input file to read
• get_json_content() - load file content in json-format
• get_args() - parses script command-line arguments
• get_smallest_bar() - accepts the file content from the load_data() function and returns the smallest bar(by seats count)
• get_user_coordinates() - accepts the user's keyboard-input and returns coordinates (float values)
• get_bar_name - accepts the bar-string(json-line) and returns the bar name
• get_biggest_bar accepts the file content from the load_data() function and returns the biggest bar(by seats count)
• get_closest_bar()- function accepts the file content from the load_data() function and returns the closest bar (using gps-coordinates entering by user)
• get_length_to_bar() - function accepts float-values and calculate length between two points

The program uses these libs from Python Standart Library:

json
argparse

How in works:

• First, you need to get source data from this url and save it to the source-file
• The program reads the first command-line argument(path to json source-file)
• loads it using json.loads() -function
• suggests user to enter the gps-coordinates
• returns info about the biggest, smallest and closest bars using get_bar_by_size() , get_closest_bar functions and prints content using print_content()-function

Example of script launch on Linux, Python 3.5:

$ python bars.py <path to file>

in the console output you will see something like this:

The largest bar  --> Спорт бар «Красная машина»
The smallest bar  --> Фреш-бар
The closest bar  --> Юнион Джек

The program check command-line arguments and if it is wrong, you will see the warning message Incorrect line argument! and usage-message.

If the content of source-file is not in JSON-format, you will see the following warning messages: Decoding JSON has failed! The source-file is not a valid JSON! Check the file content! Else if the entering data is incorrect(equal or less null), you will see the following:

Entering data is incorrect! The correct format is float: longitude=37.621587946152012 latitude=55.765366956608361 Enter the correct values,separated by whitespace!

In the cases above, the program will not run.

Project Goals

The code is written for educational purposes. Training course for web-developers - DEVMAN.org