Uvicorn & Gunicorn
Uvicorn and GunicornUvicorn and Gunicorn are important concepts when developing applications in Python. However, there are many concepts to be aware of in order to fully understand Uvicorn and Gunicorn. The following is a brief summary of the necessary concepts, and the details will be dealt with separately later.Necessary ConceptsStarletteStarlette is a Web application server that can run asynchronously. Starlette runs on top of Uvicorn.FastAPIFastAPI provides many features on top of Starlet...
Gas optimization in Solidity, Ethereum
I’m sorry but my English is terrible. I hope you understand that generously.Recently, I was developing a toy project named Blind Market. It’s a simple P2P trading application using smart contract. I was making a contract using Solidity, and the trade stage proceeded in the order of pending, shipping, and done. The problem was appeared in done phase. The problem was that when I tried to close the transaction by paying the price raised by the seller in msg.value, the following error occurred.Pe...
P2WPKH
P2WPKHP2WPKH란 비트코인 내에서 가장 일반적인 스크립트 형식으로 비트코인 프로토콜에 대한 지불 거래 유형이다. 주소는 1로 시작하는데, 세그윗을 지원하는 새로운 주소 3 또는 bc1로 시작하는 주소보다 훨씬 비싸다. https://mirror.xyz/0xA1d9f681B25C14C1eE7B87f1CF102E73cA3ad4d9/egjhNVklgy_LgZmcTXXAOTBa6ePBqO3Ja9ZSoDIad-8 즉, 비트코인 주소가 1로 시작하면 P2PKH 주소를 사용하고 있는 것이다. 공개키의 간단한 해시이며, 이 해시를 주소로 사용하는 것이다. 이것은 원래 비트코인 주소 형식이었으며 오늘까지도 충실히 작동한다. 레거시 주소는 세그윗과 호환되지 않지만, 여전히 문제없이 P2PKH 주소에서 세그윗 주소로 BTC를 보낼 수 있다. 그러나 레거시 주소 트랜잭션이 더 크기 때문에 P2PKH 주소에서 전송하는 평균 속도는 세그윗 주소에서 전송할 때보다 더 높은 요금이 발생할 수 있다....
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Uvicorn & Gunicorn
Uvicorn and GunicornUvicorn and Gunicorn are important concepts when developing applications in Python. However, there are many concepts to be aware of in order to fully understand Uvicorn and Gunicorn. The following is a brief summary of the necessary concepts, and the details will be dealt with separately later.Necessary ConceptsStarletteStarlette is a Web application server that can run asynchronously. Starlette runs on top of Uvicorn.FastAPIFastAPI provides many features on top of Starlet...
Gas optimization in Solidity, Ethereum
I’m sorry but my English is terrible. I hope you understand that generously.Recently, I was developing a toy project named Blind Market. It’s a simple P2P trading application using smart contract. I was making a contract using Solidity, and the trade stage proceeded in the order of pending, shipping, and done. The problem was appeared in done phase. The problem was that when I tried to close the transaction by paying the price raised by the seller in msg.value, the following error occurred.Pe...
P2WPKH
P2WPKHP2WPKH란 비트코인 내에서 가장 일반적인 스크립트 형식으로 비트코인 프로토콜에 대한 지불 거래 유형이다. 주소는 1로 시작하는데, 세그윗을 지원하는 새로운 주소 3 또는 bc1로 시작하는 주소보다 훨씬 비싸다. https://mirror.xyz/0xA1d9f681B25C14C1eE7B87f1CF102E73cA3ad4d9/egjhNVklgy_LgZmcTXXAOTBa6ePBqO3Ja9ZSoDIad-8 즉, 비트코인 주소가 1로 시작하면 P2PKH 주소를 사용하고 있는 것이다. 공개키의 간단한 해시이며, 이 해시를 주소로 사용하는 것이다. 이것은 원래 비트코인 주소 형식이었으며 오늘까지도 충실히 작동한다. 레거시 주소는 세그윗과 호환되지 않지만, 여전히 문제없이 P2PKH 주소에서 세그윗 주소로 BTC를 보낼 수 있다. 그러나 레거시 주소 트랜잭션이 더 크기 때문에 P2PKH 주소에서 전송하는 평균 속도는 세그윗 주소에서 전송할 때보다 더 높은 요금이 발생할 수 있다....
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The scopes that distinguishes a particular objects by name
Mapping between names and actual objects
If the namespaces belong to are different, it becomes possible to have the same name point to different objects
Generally in Python, configuration of main module is as follows.
def main():
pass
if __name__ == '__main__':
main()
# do something ...
Actually, Python is script language. So there is no main function that execute automatically.
If we once run the module, all non-indented code (Lv 0 code) is executed, and function and classes are defined only and not executed.
Therefore, as in the example above, it may be difficult to find reason to define the main function and execute it with the if statement below.
However, there is a reason why most codes follow the above format.
Python's namespace can be classified into three categories
Exists for each module, and names of global variables, functions or classes are included here.
a = 3
print(globals())
>> {'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <_frozen_importlib_external.SourceFileLoader object at 0x1046110f0>, '__spec__': None, '__annotations__': {}, '__builtins__': <module 'builtins' (built-in)>, '__file__': '/Users/namespace.py', '__cached__': None, 'a': 3}
Exists for each function or method, and names of local variables in functions are included here.
a = 3
def func():
a = 100
b = 'python'
print
def printer():
print('hello')
func()
print(globals())
>> outer_func namespace {'v': 'world', 'a': 100, 'b': 'python'}
>> inner_func namespace {}
Names of basic built-in function and basic exceptions belongs here. Includes all scopes of code written in Python.
Python’s namespace has the following characteristics.
All namespaces are implemented by shape of dictionary.
All names consists of strings themselves, each of which points to an actual object in the scope of its own namespace.
Since the mapping between the name and the actual object is mutable. Therefore, new name can be added during runtime.
But, built-in namespaces cannot be deleted or added arbitrarily.
The scopes that distinguishes a particular objects by name
Mapping between names and actual objects
If the namespaces belong to are different, it becomes possible to have the same name point to different objects
Generally in Python, configuration of main module is as follows.
def main():
pass
if __name__ == '__main__':
main()
# do something ...
Actually, Python is script language. So there is no main function that execute automatically.
If we once run the module, all non-indented code (Lv 0 code) is executed, and function and classes are defined only and not executed.
Therefore, as in the example above, it may be difficult to find reason to define the main function and execute it with the if statement below.
However, there is a reason why most codes follow the above format.
Python's namespace can be classified into three categories
Exists for each module, and names of global variables, functions or classes are included here.
a = 3
print(globals())
>> {'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <_frozen_importlib_external.SourceFileLoader object at 0x1046110f0>, '__spec__': None, '__annotations__': {}, '__builtins__': <module 'builtins' (built-in)>, '__file__': '/Users/namespace.py', '__cached__': None, 'a': 3}
Exists for each function or method, and names of local variables in functions are included here.
a = 3
def func():
a = 100
b = 'python'
print
def printer():
print('hello')
func()
print(globals())
>> outer_func namespace {'v': 'world', 'a': 100, 'b': 'python'}
>> inner_func namespace {}
Names of basic built-in function and basic exceptions belongs here. Includes all scopes of code written in Python.
Python’s namespace has the following characteristics.
All namespaces are implemented by shape of dictionary.
All names consists of strings themselves, each of which points to an actual object in the scope of its own namespace.
Since the mapping between the name and the actual object is mutable. Therefore, new name can be added during runtime.
But, built-in namespaces cannot be deleted or added arbitrarily.
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