Is String a Number? (Part II)

Is String a Number? (Part II)


You are given a string. Your function should return True if the string is a valid number (contains only digits and "+-." at proper places), otherwise - False. Look at the mask:

[+- ][zero or more digits][.][zero or more digits]

Of course, not all parts are necessary (but at least one digit part is!). For example, "+10." or "-.55" are valid numbers, where part equal 0 is omitted.

Input: A string (str).

Output: Logic value (bool).


assert is_number("34") == True
assert is_number("df") == False
assert is_number("") == False
assert is_number("+10.0") == True
Invalid hot key. Each hot key should be unique and valid
Hot keys:
CheckiO Extensions

CheckiO Extensions allow you to use local files to solve missions. More info in a blog post.

In order to install CheckiO client you'll need installed Python (version at least 3.8)

Install CheckiO Client first:

pip3 install checkio_client

Configure your tool

checkio --domain=py config --key=

Sync solutions into your local folder

checkio sync

(in beta testing) Launch local server so your browser can use it and sync solution between local file end extension on the fly. (doesn't work for safari)

checkio serv -d

Alternatevly, you can install Chrome extension or FF addon

checkio install-plugin
checkio install-plugin --ff
checkio install-plugin --chromium

Read more here about other functionality that the checkio client provides. Feel free to submit an issue in case of any difficulties.

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