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authorSkip Montanaro <skip@pobox.com>2003-05-07 15:29:12 (GMT)
committerSkip Montanaro <skip@pobox.com>2003-05-07 15:29:12 (GMT)
commitb4f12424a540045f2f6cc7f4216426a4bb3b9746 (patch)
tree6be0c214b5ae8287e2b232ae845b6c2dd6ac83a7
parente9709e7e34c2037bed44ef27630ae40db40a17a9 (diff)
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replace most uses of `...` by repr(...), noting that `...` is discouraged,
but convenient in interactive sessions.
-rw-r--r--Doc/tut/tut.tex32
1 files changed, 15 insertions, 17 deletions
diff --git a/Doc/tut/tut.tex b/Doc/tut/tut.tex
index f79a183..a60d442 100644
--- a/Doc/tut/tut.tex
+++ b/Doc/tut/tut.tex
@@ -2765,9 +2765,9 @@ resulting from this formatting operation.
One question remains, of course: how do you convert values to strings?
Luckily, Python has ways to convert any value to a string: pass it to
-the \function{repr()} or \function{str()} functions, or just write
-the value between reverse quotes (\code{``}, equivalent to
-\function{repr()}).
+the \function{repr()} or \function{str()} functions. Reverse quotes
+(\code{``}) are equivalent to \function{repr()}, but their use is
+discouraged.
The \function{str()} function is meant to return representations of
values which are fairly human-readable, while \function{repr()} is
@@ -2786,28 +2786,26 @@ Some examples:
>>> s = 'Hello, world.'
>>> str(s)
'Hello, world.'
->>> `s`
+>>> repr(s)
"'Hello, world.'"
>>> str(0.1)
'0.1'
->>> `0.1`
+>>> repr(0.1)
'0.10000000000000001'
>>> x = 10 * 3.25
>>> y = 200 * 200
->>> s = 'The value of x is ' + `x` + ', and y is ' + `y` + '...'
+>>> s = 'The value of x is ' + repr(x) + ', and y is ' + repr(y) + '...'
>>> print s
The value of x is 32.5, and y is 40000...
->>> # Reverse quotes work on other types besides numbers:
-... p = [x, y]
->>> ps = repr(p)
->>> ps
-'[32.5, 40000]'
->>> # Converting a string adds string quotes and backslashes:
+>>> # The repr() of a string adds string quotes and backslashes:
... hello = 'hello, world\n'
->>> hellos = `hello`
+>>> hellos = repr(hello)
>>> print hellos
'hello, world\n'
->>> # The argument of reverse quotes may be a tuple:
+>>> # The argument to repr() may be any Python object:
+... repr(x, y, ('spam', 'eggs'))
+"(32.5, 40000, ('spam', 'eggs'))"
+>>> # reverse quotes are convenient in interactive sessions:
... `x, y, ('spam', 'eggs')`
"(32.5, 40000, ('spam', 'eggs'))"
\end{verbatim}
@@ -2817,9 +2815,9 @@ Here are two ways to write a table of squares and cubes:
\begin{verbatim}
>>> import string
>>> for x in range(1, 11):
-... print string.rjust(`x`, 2), string.rjust(`x*x`, 3),
+... print string.rjust(repr(x), 2), string.rjust(repr(x*x), 3),
... # Note trailing comma on previous line
-... print string.rjust(`x*x*x`, 4)
+... print string.rjust(repr(x*x*x), 4)
...
1 1 1
2 4 8
@@ -3357,7 +3355,7 @@ example:
... def __init__(self, value):
... self.value = value
... def __str__(self):
-... return `self.value`
+... return repr(self.value)
...
>>> try:
... raise MyError(2*2)