[PYTHON] Global and local variables 2

1

player = 'Taro'

def f():
    player = 'Jiro'
    print('local:', locals())

f()
print(player)

Execution result of 1

local: {'player': 'Jiro'}
Taro

Without declaring local variables When you execute locals (),

2

player = 'Taro'

def f():
    print('local:', locals())

f()
print(player)

Execution result of 2

local: {}
Taro

An empty dictionary is returned.

When I also run globals (),

3

player = 'Taro'

def f():
    print('local:', locals())

f()
print('global:', globals())

Execution result of 3

local: {}
global: {'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <_frozen_importlib_external.SourceFileLoader object at 0x7efff584a2b0>, '__spec__': None, '__annotations__': {}, '__builtins__': <module 'builtins' (built-in)>, '__file__': 'Main.py', '__cached__': None, 'player': 'Taro', 'f': <function f at 0xxxxxxxxxxxxx>}

Many come out, 'player': It says'Taro'.

Besides, __name__ is __main__, __doc__ is None without anything in it Something that has been declared in advance will come out.

If you write a document for this function here,

4

"""
test ##################
"""

player = 'Taro'

def f():
    print('local:', locals())

f()
print('global:', globals())

Execution result of 4

local: {}
global: {'__name__': '__main__', '__doc__': '\ntest ##################\n', '__package__': None, '__loader__': <_frozen_importlib_external.SourceFileLoader object at 0x7f73121652b0>, '__spec__': None, '__annotations__': {}, '__builtins__': <module 'builtins' (built-in)>, '__file__': 'Main.py', '__cached__': None, 'player': 'Taro', 'f': <function f at 0x7f7312236e18>}

__doc__ is now'\ ntest ################## \ n.

If you also look at __name__ and __doc__ in the function,

5

player = 'Taro'

def f():
    """Test func doc"""
    print(f.__name__)
    print(f.__doc__)

f()
print('global:', __name__)

Execution result of 5

f
Test func doc
global: __main__

First, print(f.__name__) Outputs the name of the function f with next, The document of the function f is output by print (f.__doc__). Finally, With print ('global:', __name__) The string'global:' is followed by the name of the entire function.