SunFounder ESP32 Manual page 301

File "<stdin>", line 6, in <module>
TypeError: function takes 2 positional arguments but 1 were given
welcome()No arguments
>>> %Run -c $EDITOR_CONTENT
Traceback (most recent call last):
File "<stdin>", line 6, in <module>
TypeError: function takes 2 positional arguments but 0 were given
Default Arguments
In MicroPython, we can use the assignment operator (=) to provide a default value for the parameter.
If we call the function without argument, it uses the default value.
def
welcome(name, msg
"""This is a welcome function for
the person with the provided message"""
print("Hello", name
welcome("Lily")
>>> %Run -c $EDITOR_CONTENT
Hello Lily, Welcome to China!
In this function, the parameter name has no default value and is required (mandatory) during the call.
On the other hand, the default value of the parameter msg is "Welcome to China!". Therefore, it is optional during the
call. If a value is provided, it will overwrite the default value.
Any number of arguments in the function can have a default value. However, once there is a default argument, all
arguments on its right must also have default values.
This means that non-default arguments cannot follow default arguments.
For example, if we define the above function header as:
def welcome(name = "Lily", msg):
We will receive the following error message:
>>> %Run -c $EDITOR_CONTENT
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
SyntaxError: non-default argument follows default argument
3.6. 1.6 (Optional) MicroPython Basic Syntax
= "Welcome to China!"):
+ , + msg)
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