If you want to change selection, open original toplevel document below and click on "Move attachment"
Parent (intermediate) annotation
Open it A numeral evaluates to the number it names,
Original toplevel document
1.2 Elements of Programming rule
is applied, and the result of that expression. Viewing evaluation in terms of
this tree, we can imagine that the values of the operands percolate upward,
starting from the terminal nodes and then combining at higher and higher
levels.
<span>Next, observe that the repeated application of the first step brings us to the
point where we need to evaluate, not call expressions, but primitive expressions
such as numerals (e.g., 2) and names (e.g., add ). We take care of the
primitive cases by stipulating that
A numeral evaluates to the number it names, A name evaluates to the value associated with that name in the current
environment.
Notice the important role of an environment in determining the meaning of the
symbols in expressions. In Python, it is meaningless to speak of the value of an
expression such as
>>> add(x, 1)
without specifying any information about the environment that would provide a
m
Summary
status
not learned
measured difficulty
37% [default]
last interval [days]
repetition number in this series
0
memorised on
scheduled repetition
scheduled repetition interval
last repetition or drill
Details
No repetitions
Discussion
Do you want to join discussion? Click here to log in or create user.