Flask instanciation app = Flask()

flask, init, python

Solution

If you understand the concept of class and objects, then `__init__` is the constructor which initializes an instance of the class. In this case, the class is Flask and when you do the following, you are initializing the instance of a Flask object:

app = Flask(__name__)

Now your question, "Where is this init method that takes at least 2 arguments?"

That can be explained as per the definition below that defines the constructor in the code.

def __init__(self, import_name, static_path=None, static_url_path=None,
                 static_folder='static', template_folder='templates',
                 instance_path=None, instance_relative_config=False):

If you see above, `self` and `import name` is the required parameter and rest are all defaulted or not required. The `self` is needed by Python even though you can name it anything else. read this blog by creator of python himself for why http://neopythonic.blogspot.com/2008/10/why-explicit-self-has-to-stay.html

Problem

I intentionally removed name in app = Flask(name) and I get this error: ``` Traceback (most recent call last): File "routes.py", line 4, in <module> app = Flask() TypeError: __init__() takes at least 2 arguments (1 given) ``` this is my code from nettuts and here is my code: ``` from flask import Flask, render_template app = Flask() @app.route('/') def home(): return render_template('home.html') @app.route('/about') def about(): return render_template('about.html') if __name__ == '__main__': app.run(debug=True) ``` My question is: Where is this init method that takes at least 2 arguments?

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