Welcome to interrogatio’s documentation!¶

A python library to prompt users for inputs in a terminal application.

What is interrogatio¶

interrogatio is a python 2/3 library based on the python-prompt-toolkit and inspired by PyInquirer that help CLI developers to ask users for inputs.

Questions can be rendered onto the terminal prompt or as curses-like dialogs.

Getting started¶

Requirements¶

interrogatio depends on the python-prompt-toolkit library and its dependencies.

Installation¶

Using pip¶

$ pip install interrogatio

Extra dependencies¶

If you want to use the shell command with yml files you can install the yml dependency:

$ pip install interrogatio[yml]

Basic usage¶

interrogatio needs a list of questions to prompt the user for answers.

Each question is a python dictionary with at least the following keys:

name: it has to be unique within the list of questions. It represents the variable name;

type: the type of question;

message: the text of the prompt.

Optionally you should specify:

a default: a default value;

a validators: a list of children of Validator class

a question_mark: you can customize the question mark symbol.

a values: a list of tuples (value, label) to provide a list of choices for the selectone or selectmany question types.

Each type of question is managed by a interrogatio.handlers.QHandler.

See the Question handlers section for more information.

Run interrogatio¶

Prompt mode¶

from interrogatio import interrogatio

questions = [
    {
        'name': 'name',
        'type': 'input',
        'message': "What's your name ?",
        'description': 'Please enter your full name. This field is required.',
        'validators': [{'name': 'required'}],
    },
    {
        'name': 'birth_date',
        'type': 'date',
        'message': "What's your birth date ?",
        'description': 'Enter your birth date.',
    },
    {
        'name': 'nationality',
        'type': 'selectone',
        'message': "What's your nationality ?",
        'description': 'Please choose one from the list.',
        'validators': [{'name': 'required'}],
        'values': [
            ('IT', 'Italian'),
            ('ES', 'Spanish'),
            ('US', 'American'),
            ('UK', 'English'),
        ],
    },
    {
        'name': 'languages',
        'type': 'selectmany',
        'message': "What are your favorite programming languages ?",
        'description': 'Please choose your favorites from the list.',
        'values': [
            ('py', 'Python'),
            ('rb', 'Ruby'),
            ('js', 'Javascript'),
            ('go', 'Golang'),
            ('rs', 'Rust'),
            ('c', 'C'),
            ('cpp', 'C++'),
            ('java', 'Java'),
        ],
    },
]


answers = interrogatio(questions)

Dialog mode¶

from interrogatio import dialogus

questions = [
    {
        'name': 'name',
        'type': 'input',
        'message': "What's your name ?",
        'description': 'Please enter your full name. This field is required.',
        'validators': [{'name': 'required'}],
    },
    {
        'name': 'birth_date',
        'type': 'date',
        'message': "What's your birth date ?",
        'description': 'Enter your birth date.',
    },
    {
        'name': 'nationality',
        'type': 'selectone',
        'message': "What's your nationality ?",
        'description': 'Please choose one from the list.',
        'validators': [{'name': 'required'}],
        'values': [
            ('IT', 'Italian'),
            ('ES', 'Spanish'),
            ('US', 'American'),
            ('UK', 'English'),
        ],
    },
    {
        'name': 'languages',
        'type': 'selectmany',
        'message': "What are your favorite programming languages ?",
        'description': 'Please choose your favorites from the list.',
        'values': [
            ('py', 'Python'),
            ('rb', 'Ruby'),
            ('js', 'Javascript'),
            ('go', 'Golang'),
            ('rs', 'Rust'),
            ('c', 'C'),
            ('cpp', 'C++'),
            ('java', 'Java'),
        ],
    },
]

intro = """<blue>Welcome to <b><i>interrogatio 2.0</i></b>!

This is the second major release of interrogatio with nice improvements.</blue>

<b>What's new</b>
<b>----------</b>

* Curses-like dialog experience had been completely rewritten.
* New questions handlers for dates, date ranges and masked inputs.
* Validators are now based on the <u>validators</u> library.
"""


answers = dialogus(questions, 'interrogatio showcase', intro=intro, summary=True)

You can customize the dialog title and the confirm and cancel buttons text.

Validation¶

You could specify a list of validators for each question:

from interrogatio import dialogus
from interrogatio.validators import RequiredValidator, MinLengthValidator

questions = [
    {
        'name': 'username',
        'type': 'input',
        'message': 'Enter your username',
        'validators': [RequiredValidator()]

    },
    {
        'name': 'password',
        'type': 'password',
        'message': 'Enter your password',
        'validators': [MinLengthValidator(8)]
    }  ,
]
answers = dialogus(
    questions,
    'Please enter your credential',
    finish='login',
    cancel='cancel',
)

Validators can also be expressed using aliases:

from interrogatio import dialogus
from interrogatio.validators import RequiredValidator, MinLengthValidator

questions = [
    {
        'name': 'username',
        'type': 'input',
        'message': 'Enter your username',
        'validators': [
            {
                'name': 'required'
            }
        ]

    },
    {
        'name': 'favorite_pet',
        'type': 'input',
        'message': 'What is your favorite pet',
        'validators': [
            {
                'name': 'min-length',
                'args': {
                    'min_length': 8
                }
            }
        ]
    }
]
answers = dialogus(
    questions,
    'Please enter your credential',
    finish='login',
    cancel='cancel',
)

This way you can read questions from a json or yaml file.

Shell command¶

Interrogatio ships with a shell command that can be usefull for shell scripting. Questions can be provided both as a json or yaml file (Needs pyYAML).

Usage¶

Prompt mode¶

usage: interrogatio [-h] –input INPUT [–output OUTPUT] [–input-format {json,yaml}] [–output-format {json,yaml}] [–theme THEME]

Prompt user for questions.

optional arguments: -h, –help show this help message and exit –input INPUT, -i INPUT

Input file with questions

`--output OUTPUT, -o OUTPUT`
	Output file to write answers to (Default: STDOUT)

–input-format {json,yaml}: Questions file format (Default: json)
–output-format {json,yaml}: Answers file format (Default: json)

`--theme THEME, -t THEME`
	Name of the UI theme to use (Default: default)

Dialog mode¶

..code-block:: bash

$ dialogus –help

usage: dialogus [-h] –input INPUT [–output OUTPUT] [–input-format {json,yaml}] [–output-format {json,yaml}] [–theme THEME] [–title TITLE] [–intro INTRO]: [–summary] [–previous PREVIOUS] [–next NEXT] [–cancel CANCEL] [–finish FINISH]

Show a wizard dialog to prompt user for questions.

optional arguments: -h, –help show this help message and exit –input INPUT, -i INPUT

Input file with questions

`--output OUTPUT, -o OUTPUT`
	Output file to write answers to (Default: STDOUT)

–input-format {json,yaml}: Questions file format (Default: json)
–output-format {json,yaml}: Answers file format (Default: json)

`--theme THEME, -t THEME`
	Name of the UI theme to use (Default: default)
`--title TITLE`	Title of the dialog
`--intro INTRO`	Specify the text of the introduction step (Default: no intro)
`--summary`	Show a summary with answers as the latest step (Default: no summary)
`--previous PREVIOUS`
	Customize the text of the “previous” button (Default: Previous)
`--next NEXT`	Customize the text of the “next” button (Default: Next)
`--cancel CANCEL`
	Customize the text of the “cancel” button (Default: Cancel)
`--finish FINISH`
	Customize the text of the “finish” button (Default: Finish)

Question handlers¶

interrogatio 1.0.0 has these built-in type of handlers:

input: for strings and numbers

password: for password

selectone: like a radio list, users have to choose one value from a list of choices.

selectmany: like a checkbox list, users can choose multiple values within a list of choices.

input¶

The input handler prompts the user for a string or a number. You can provide it with a default value.

password¶

The password handler hides the user input with an asterisk symbol.

selectone¶

The selectone handler allow the user to choose from a list of values. To choose a value, users can move up and down the list with the arrow keys, select a value using the space key and accept the answer using the enter key.

The list of values to choose from must be provided as a list of tuples (or two element lists) where, like a html radio input, the first element of the tuple is the value and the second one is the label.

selectmany¶

The selectone handler allow the user to choose multiple answers from a list of values.

To choose a value, users can move up and down the list with the arrow keys, select a value using the space key and accept the answer using the enter key.

The list of values to choose from must be provided as a list of tuples (or two element lists) where, like a html radio input, the first element of the tuple is the value and the second one is the label.

This input handler return a list with the chosen values.

maskedinput¶

The maskedinput handler allow the user to enter an input given a mask.

date¶

The date handler allow the user to enter a date.

daterange¶

The daterange handler allow the user to enter a range of dates.

Welcome to interrogatio’s documentation!¶

What is interrogatio¶

Getting started¶

Requirements¶

Installation¶

Using pip¶

Extra dependencies¶

Basic usage¶

Run interrogatio¶

Prompt mode¶

Dialog mode¶

Validation¶

Shell command¶

Usage¶

Prompt mode¶

Dialog mode¶

Question handlers¶

input¶

password¶

selectone¶

selectmany¶

maskedinput¶

date¶

daterange¶

Indices and tables¶