Mẹo If a function doesn’t have a return statement, which of the following does the function return?
Kinh Nghiệm Hướng dẫn If a function doesn’t have a return statement, which of the following does the function return? Chi Tiết
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Nội dung chính- Every Function returns SomethingWhat happens when the return statement has nothing?Python Functions can have multiple return statementsPython Function can return multiple types of valuesReturning Multiple Values in a single return StatementPython return statement with finally blockReferences:What does the function return if it doesn't have a return statement?When a function does not have a return statement What does the function return when called in Python?Which function does not use a return statement?What happens if a function doesn't return anything?
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- The python return statement is used in a function to return something to the caller program.We can use the return statement inside a function only.In Python, every function
returns something. If there are no return statements, then it returns None.If the return statement contains an expression, it’s evaluated first and then the value is returned.The return statement terminates the function execution.A function can have multiple return statements. When any of them is executed, the function terminates.A function can return multiple types of values.Python function can return multiple values in a single
return statement.
Let’s look a simple example to add two numbers and return the total to the caller.
def add(x, y): total = x + y return total
We can optimize the function by having the expression in the return statement.
def add(x, y): return x + y
Every Function returns Something
Let’s see what is returned when a function doesn’t have a return statement.
>>> def foo(): ... pass ... >>> >>> print(foo()) None >>>
Python Return
None
What happens when the return statement has nothing?
When the return statement has no value, the function returns None.
>>> def return_none(): ... return ... >>> print(return_none()) None >>>
Python Functions can have multiple return statements
def type_of_int(i): if i % 2 == 0: return 'even' else: return 'odd'
Python Function can return multiple types of values
Unlike other programming languages, python functions are not restricted to return a single type of value. If you look the function definition, it doesn’t have any information about what it can return.
Let’s look an example where the function will return multiple types of values.
def get_demo_data(object_type): if 'str' == object_type: return 'test' elif 'tuple' == object_type: return (1, 2, 3) elif 'list' == object_type: return [1, 2, 3] elif 'dict' == object_type: return "1": 1, "2": 2, "3": 3 else: return None
Returning Multiple Values in a single return Statement
We can return multiple values from a single return statement. These values are separated by a comma and returned as a tuple to the caller program.
def return_multiple_values(): return 1, 2, 3 print(return_multiple_values()) print(type(return_multiple_values()))
Output:
(1, 2, 3)
Python return Multiple ValuesPython return statement with finally block
When return statement is executed inside a try-except block, the finally block code is executed first before returning the value to the caller.
def hello(): try: return 'hello try' finally: print('finally block') def hello_new(): try: raise TypeError except TypeError as te: return 'hello except' finally: print('finally block') print(hello()) print(hello_new())
Output:
finally block hello try finally block hello except
If the finally block has a return statement, then the earlier return statement gets ignored and the value from the finally block is returned.
def hello(): try: return 'hello try' finally: print('finally block') return 'hello from finally' print(hello())
Output:
finally block hello from finally
References:
- Python Official Docs
What does the function return if it doesn't have a return statement?
If no return statement appears in a function definition, control automatically returns to the calling function after the last statement of the called function is executed. In this case, the return value of the called function is undefined.When a function does not have a return statement What does the function return when called in Python?
So, if you don't explicitly use a return value in a return statement, or if you totally omit the return statement, then Python will implicitly return a default value for you. That default return value will always be None .Which function does not use a return statement?
In lieu of a data type, void functions use the keyword "void." A void function performs a task, and then control returns back to the caller--but, it does not return a value. You may or may not use the return statement, as there is no return value.What happens if a function doesn't return anything?
PyCharm assumes a missing return value if the return value statically evaluates to None . This can happen if initialising values using None , and changing their type later on. The problem is that you are overwriting a statically inferred class attribute by means of a dynamically assigned instance attribute. Tải thêm tài liệu liên quan đến nội dung bài viết If a function doesn’t have a return statement, which of the following does the function return?
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