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-rw-r--r--Doc/tutorial/controlflow.rst18
1 files changed, 9 insertions, 9 deletions
diff --git a/Doc/tutorial/controlflow.rst b/Doc/tutorial/controlflow.rst
index 5e4de0e..8a2d645 100644
--- a/Doc/tutorial/controlflow.rst
+++ b/Doc/tutorial/controlflow.rst
@@ -225,14 +225,14 @@ boundary::
>>> def fib(n): # write Fibonacci series up to n
... """Print a Fibonacci series up to n."""
... a, b = 0, 1
- ... while b < n:
- ... print(b, end=' ')
+ ... while a < n:
+ ... print(a, end=' ')
... a, b = b, a+b
... print()
...
>>> # Now call the function we just defined:
... fib(2000)
- 1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 1597
+ 0 1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 1597
.. index::
single: documentation strings
@@ -276,7 +276,7 @@ mechanism::
<function fib at 10042ed0>
>>> f = fib
>>> f(100)
- 1 1 2 3 5 8 13 21 34 55 89
+ 0 1 1 2 3 5 8 13 21 34 55 89
Coming from other languages, you might object that ``fib`` is not a function but
a procedure since it doesn't return a value. In fact, even functions without a
@@ -296,14 +296,14 @@ Fibonacci series, instead of printing it::
... """Return a list containing the Fibonacci series up to n."""
... result = []
... a, b = 0, 1
- ... while b < n:
- ... result.append(b) # see below
+ ... while a < n:
+ ... result.append(a) # see below
... a, b = b, a+b
... return result
...
>>> f100 = fib2(100) # call it
>>> f100 # write the result
- [1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89]
+ [0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89]
This example, as usual, demonstrates some new Python features:
@@ -311,7 +311,7 @@ This example, as usual, demonstrates some new Python features:
:keyword:`return` without an expression argument returns ``None``. Falling off
the end of a function also returns ``None``.
-* The statement ``result.append(b)`` calls a *method* of the list object
+* The statement ``result.append(a)`` calls a *method* of the list object
``result``. A method is a function that 'belongs' to an object and is named
``obj.methodname``, where ``obj`` is some object (this may be an expression),
and ``methodname`` is the name of a method that is defined by the object's type.
@@ -320,7 +320,7 @@ This example, as usual, demonstrates some new Python features:
object types and methods, using *classes*, see :ref:`tut-classes`)
The method :meth:`append` shown in the example is defined for list objects; it
adds a new element at the end of the list. In this example it is equivalent to
- ``result = result + [b]``, but more efficient.
+ ``result = result + [a]``, but more efficient.
.. _tut-defining: