If Statement State Property

If there is an "if" statement at the current line and tab, then the expression state is updated to "begin_expr." More formally,

if the following are true:

  • the line at time t = i
  • the tab at time t = j
  • statement at line i, tab j = if test:
  • expression state at time t = "not_expr"

then expression state at time (t + 1) = "begin_expr"

When Python sees an "if" statement, Python first evaluates the test by setting the expression state to "begin_expr."

For example,

if the following are true:

  • the line at time 0 = 0
  • the tab at time 0 = 0
  • statement at line 0, tab 0 = if __eq__(3, 3):
  • expression state at time 0 = "not_expr"

then expression state at time (0 + 1) = "begin_expr"

Try stepping through the simulator to see the "Expression State" change to "begin_expr."

Code Editor
LW Python State
Current Line1Current Tab0Time0
LW Python Simulator

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