英文:
Python Decorator: Count Function Calls
问题
我想创建一个装饰器来计算函数调用次数。
我已经接近成功，但问题是每个函数都有一个单独的字典输出，我想要将每个函数存储在一个字典中。
如何创建一个全局字典来存储这样的数据？我尝试添加另一个创建字典的装饰器，但没有帮助，非局部变量也没有帮助？
def count(func):
def inner():
inner.calls += 1
if inner.calls > 1:
count_update = inner.dict[func.__name__] + 1
update = {func.__name__:count_update}
inner.dict.update(update)
else:
inner.dict={func.__name__:1}
func()
print(f'当前状态 {inner.dict}')
inner.calls = 0
inner.dict={}
return inner
@count
def show_date():
current_time = datetime.now()
current_time_formatted = current_time.strftime("%Y-%d-%B-%A")
print(current_time_formatted)
return current_time_formatted
@count
def print_random_number2():
numb = random.randint(0,10000)
string_final=f'数字是 {numb}'
print(string_final)
return string_final
show_date()
show_date()
show_date()
print_random_number2()
print_random_number2()
show_date()
英文:
I want to create decorator that calculates funtion calls.
I am close but the problem is output is separate dictionary for every function, I want every function to be stored in one dictionary.
How to make global dictionary which can store such data, I tried adding another decorator that created dictionary but it did not help, nonlocal variable also did not help either?
def count(func):
def inner():
inner.calls += 1
if inner.calls > 1:
count_update = inner.dict[func.__name__] + 1
update = {func.__name__:count_update}
inner.dict.update(update)
else:
inner.dict={func.__name__:1}
func()
print(f'Current state {inner.dict}')
inner.calls = 0
inner.dict={}
return inner
@count
def show_date():
current_time = datetime.now()
current_time_formatted = current_time.strftime("%Y-%d-%B-%A")
print(current_time_formatted)
return current_time_formatted
@count
def print_random_number2():
numb = random.randint(0,10000)
string_final=f'Number is {numb}'
print(string_final)
return string_final
show_date()
show_date()
show_date()
print_random_number2()
print_random_number2()
show_date()
答案1
得分: 1
你可以通过在全局范围内创建一个字典来声明全局字典（即在函数外部）：
func_counts = {}
def count(func):
def inner():
func_counts[func.__name__] = func_counts.get(func.__name__, 0) + 1
func()
print(f'当前状态 {func_counts}')
return inner
不需要使用 global 或 nonlocal 来声明它，因为你在函数内部没有重新绑定它。
英文:
You can declare a global dictionary by just creating a dictionary in the global scope (i.e. outside the function):
func_counts = {}
def count(func):
def inner():
func_counts[func.__name__] = func_counts.get(func.__name__, 0) + 1
func()
print(f'Current state {func_counts}')
return inner
It's not necessary to declare it with global or nonlocal because you aren't rebinding it inside the function.
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