class_docstr: This analyse extract positive subscripts from code.
  
  It is flow sensitive and aliasing is not taken into account as integer
  doesn't create aliasing in Python.
  
  >>> import gast as ast
  >>> from pythran import passmanager, backend
  >>> node = ast.parse('''
  ... def foo(a):
  ...     for i in builtins.range(1, 10):
  ...         c = i // 2''')
  >>> pm = passmanager.PassManager("test")
  >>> res = pm.gather(RangeValuesSimple, node)
  >>> res['c'], res['i']
  (Interval(low=0, high=5), Interval(low=1, high=10))
class_docstr_tok: ["This","analyse","extract","positive","subscripts","from","code",".","It","is","flow","sensitive","and","aliasing","is","not","taken","into","account","as","integer","does","n't","create","aliasing","in","Python",".",">",">",">","import","gast","as","ast",">",">",">","from","pythran","import","passmanager",",","backend",">",">",">","node","=","ast.parse","(","``","'","...","def","foo","(","a",")",":","...","for","i","in","builtins.range","(","1",",","10",")",":","...","c","=","i","\/\/","2","''","'",")",">",">",">","pm","=","passmanager.PassManager","(","``","test","''",")",">",">",">","res","=","pm.gather","(","RangeValuesSimple",",","node",")",">",">",">","res","[","'","c","'","]",",","res","[","'","i","'","]","(","Interval","(","low=0",",","high=5",")",",","Interval","(","low=1",",","high=10",")",")"]
docstr: Handle iterate variable in for loops.
  
  >>> import gast as ast
  >>> from pythran import passmanager, backend
  >>> node = ast.parse('''
  ... def foo():
  ...     a = b = c = 2
  ...     for i in builtins.range(1):
  ...         a -= 1
  ...         b += 1''')
  >>> pm = passmanager.PassManager("test")
  >>> res = pm.gather(RangeValuesSimple, node)
  >>> res['a']
  Interval(low=-inf, high=2)
  >>> res['b']
  Interval(low=2, high=inf)
  >>> res['c']
  Interval(low=2, high=2)
  
  >>> node = ast.parse('''
  ... def foo():
  ...     for i in (1, 2, 4):
  ...         a = i''')
  >>> pm = passmanager.PassManager("test")
  >>> res = pm.gather(RangeValuesSimple, node)
  >>> res['a']
  Interval(low=1, high=4)
docstr_tok: ["Handle","iterate","variable","in","for","loops",".",">",">",">","import","gast","as","ast",">",">",">","from","pythran","import","passmanager",",","backend",">",">",">","node","=","ast.parse","(","``","'","...","def","foo","(",")",":","...","a","=","b","=","c","=","2","...","for","i","in","builtins.range","(","1",")",":","...","a","-=","1","...","b","+=","1","''","'",")",">",">",">","pm","=","passmanager.PassManager","(","``","test","''",")",">",">",">","res","=","pm.gather","(","RangeValuesSimple",",","node",")",">",">",">","res","[","'","a","'","]","Interval","(","low=-inf",",","high=2",")",">",">",">","res","[","'","b","'","]","Interval","(","low=2",",","high=inf",")",">",">",">","res","[","'","c","'","]","Interval","(","low=2",",","high=2",")",">",">",">","node","=","ast.parse","(","``","'","...","def","foo","(",")",":","...","for","i","in","(","1",",","2",",","4",")",":","...","a","=","i","''","'",")",">",">",">","pm","=","passmanager.PassManager","(","``","test","''",")",">",">",">","res","=","pm.gather","(","RangeValuesSimple",",","node",")",">",">",">","res","[","'","a","'","]","Interval","(","low=1",",","high=4",")"]
code: def visit_For(self, node):
      """Handle iterate variable in for loops.
  
      >>> import gast as ast
      >>> from pythran import passmanager, backend
      >>> node = ast.parse('''
      ... def foo():
      ...     a = b = c = 2
      ...     for i in builtins.range(1):
      ...         a -= 1
      ...         b += 1''')
      >>> pm = passmanager.PassManager("test")
      >>> res = pm.gather(RangeValuesSimple, node)
      >>> res['a']
      Interval(low=-inf, high=2)
      >>> res['b']
      Interval(low=2, high=inf)
      >>> res['c']
      Interval(low=2, high=2)
  
      >>> node = ast.parse('''
      ... def foo():
      ...     for i in (1, 2, 4):
      ...         a = i''')
      >>> pm = passmanager.PassManager("test")
      >>> res = pm.gather(RangeValuesSimple, node)
      >>> res['a']
      Interval(low=1, high=4)
      """
      assert isinstance(
          node.target, ast.Name
      ), "For apply on variables."
      self.visit(node.iter)
      if isinstance(node.iter, ast.Call):
          for alias in self.aliases[node.iter.func]:
              if isinstance(alias, Intrinsic):
                  self.add(
                      node.target.id,
                      alias.return_range_content(
                          [self.visit(n) for n in node.iter.args]
                      ),
                  )
  
      self.visit_loop(
          node, ast.Compare(node.target, [ast.In()], [node.iter])
      )
  
imports: import gast
  from collections import defaultdict
  from functools import reduce
  from pythran.analyses import Aliases, CFG
  from pythran.intrinsic import Intrinsic
  from pythran.passmanager import ModuleAnalysis
  from pythran.interval import Interval, IntervalTuple, UNKNOWN_RANGE
  from pythran.tables import MODULES, attributes
label_desc: Use image node_id 10 for calling the RangeValuesSimple obj's underlying member method code with example usage: obj.visit_For(node) without return types