在idthon中`id`是關鍵字嗎？

Question

我的編輯器（TextMate）以其他顏色（當用作變量名稱）顯示id，然後顯示我通常的變量名稱。它是一個關鍵字嗎？我不想遮陽任何關鍵字...

Answer 1

id不是一個Python 關鍵字，但它是一個built-in function的名稱。

關鍵字are：

and  del  from  not  while 
as  elif  global or  with 
assert else  if  pass  yield 
break  except import print 
class  exec  in  raise 
continue finally is  return 
def  for  lambda try 

關鍵字是無效的變量名。下面是一個語法錯誤：

if = 1 

在另一方面，內置功能，如id或type或str可以陰影：

str = "hello" # don't do this 

Answer 2

它是一個內置的功能：

id(...) 
    id(object) -> integer 

    Return the identity of an object. This is guaranteed to be unique among 
    simultaneously existing objects. (Hint: it's the object's memory address.) 

Answer 3

您還可以從python獲得幫助：

>>> help(id) 
Help on built-in function id in module __builtin__: 

id(...) 
    id(object) -> integer 

    Return the identity of an object. This is guaranteed to be unique among 
    simultaneously existing objects. (Hint: it's the object's memory address.) 

或者你也可以質疑的IPython

IPython 0.10.2 [on Py 2.6.6] 
[C:/]|1> id?? 
Type:   builtin_function_or_method 
Base Class:  <type 'builtin_function_or_method'> 
String Form: <built-in function id> 
Namespace:  Python builtin 
Docstring [source file open failed]: 
    id(object) -> integer 

Return the identity of an object. This is guaranteed to be unique among 
simultaneously existing objects. (Hint: it's the object's memory address.) 

Answer 4

只爲reference purposes：

檢查，如果事情是一個Python關鍵字：

>>> import keyword 
>>> keyword.iskeyword('id') 
False 

檢查所有關鍵字的Python：

>>> keyword.kwlist 
['and', 'as', 'assert', 'break', 'class', 'continue', 'def', 'del', 'elif', 
'else', 'except', 'exec', 'finally', 'for', 'from', 'global', 'if', 'import', 
'in', 'is', 'lambda', 'not', 'or', 'pass', 'print', 'raise', 'return', 'try', 
'while', 'with', 'yield']