built-in

问题 When I try to view the built-in function all() in PyCharm, I could just see "pass" in the function body. How to view the actual implementation so that I could know what exactly the built-in function is doing? def all(*args, **kwargs): # real signature unknown """ Return True if bool(x) is True for all values x in the iterable. If the iterable is empty, return True. """ pass 回答1: Assuming you’re using the usual CPython interpreter, all is a builtin function object, which just has a pointer to

问题 Java has a ScriptEngine system that allows you to run/evaluate statements in a different language. I know for a fact that JavaScript is supported, but I couldn't find any other languages to work with it. Is, for example, Ruby implemented? 回答1: ..I know for a fact that JavaScript is supported,.. ECMAscript, technically. .. but I couldn't find any other languages to work with it. Is, for example, Ruby implemented? No. The ECMAscript engine is the only one included by default, the last time I

问题 Java has a ScriptEngine system that allows you to run/evaluate statements in a different language. I know for a fact that JavaScript is supported, but I couldn't find any other languages to work with it. Is, for example, Ruby implemented? 回答1: ..I know for a fact that JavaScript is supported,.. ECMAscript, technically. .. but I couldn't find any other languages to work with it. Is, for example, Ruby implemented? No. The ECMAscript engine is the only one included by default, the last time I

问题 I would like to call a method to give me a dict of all of the "non-private" (I use the term "private" somewhat loosely here since it does not really exist in Python) and non-builtin attributes (i.e. those that do not begin with a single or double underscore) on a class. Something like vars(MyClass) that would return only the "public" attributes on that class. I'm aware that from M import * does not import objects whose name starts with an underscore. (http://www.python.org/dev/peps/pep-0008/

问题 I would like to call a method to give me a dict of all of the "non-private" (I use the term "private" somewhat loosely here since it does not really exist in Python) and non-builtin attributes (i.e. those that do not begin with a single or double underscore) on a class. Something like vars(MyClass) that would return only the "public" attributes on that class. I'm aware that from M import * does not import objects whose name starts with an underscore. (http://www.python.org/dev/peps/pep-0008/

问题 I would like to call a method to give me a dict of all of the "non-private" (I use the term "private" somewhat loosely here since it does not really exist in Python) and non-builtin attributes (i.e. those that do not begin with a single or double underscore) on a class. Something like vars(MyClass) that would return only the "public" attributes on that class. I'm aware that from M import * does not import objects whose name starts with an underscore. (http://www.python.org/dev/peps/pep-0008/

问题 I would like to call a method to give me a dict of all of the "non-private" (I use the term "private" somewhat loosely here since it does not really exist in Python) and non-builtin attributes (i.e. those that do not begin with a single or double underscore) on a class. Something like vars(MyClass) that would return only the "public" attributes on that class. I'm aware that from M import * does not import objects whose name starts with an underscore. (http://www.python.org/dev/peps/pep-0008/

问题 This question already has answers here : Closed 9 years ago . Possible Duplicate: inheritance from str or int Hi folks, I'm trying to subclass the int class without any success. Here is my attempt: class SpecialInt(int): def __init__(self, x, base=10, important_text=''): int.__init__(self, x, base) self.important_text=important_text If I perform the following: integer = SpecialInt(123, 10, 'rage of the unicorns') I get this error: TypeRror: int() takes at most 2 arguments (3 given) Any ideas?

问题 When looping recursively through folders with files containing spaces the shell script I use is of this form, copied from the internet: while IFS= read -r -d $'\0' file; do dosomethingwith "$file" # do something with each file done < <(find /bar -name *foo* -print0) I think I understand the IFS bit, but I don't understand what the ' < <(...) ' characters mean. Obviously there's some sort of piping going on here. It's very hard to Google "< <", you see. 回答1: <() is called process substitution

问题 When looping recursively through folders with files containing spaces the shell script I use is of this form, copied from the internet: while IFS= read -r -d $'\0' file; do dosomethingwith "$file" # do something with each file done < <(find /bar -name *foo* -print0) I think I understand the IFS bit, but I don't understand what the ' < <(...) ' characters mean. Obviously there's some sort of piping going on here. It's very hard to Google "< <", you see. 回答1: <() is called process substitution