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nexedi
cython
Commits
3f5848fc
Commit
3f5848fc
authored
Jun 21, 2018
by
gabrieldemarmiesse
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Moved examples from string.rst and completed them to make them runnable.
parent
04780910
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-16
docs/examples/tutorial/string/for_bytes.pyx
docs/examples/tutorial/string/for_bytes.pyx
+6
-0
docs/examples/tutorial/string/for_unicode.pyx
docs/examples/tutorial/string/for_unicode.pyx
+6
-0
docs/examples/tutorial/string/if_char_in.pyx
docs/examples/tutorial/string/if_char_in.pyx
+5
-0
docs/src/tutorial/strings.rst
docs/src/tutorial/strings.rst
+6
-16
No files found.
docs/examples/tutorial/string/for_bytes.pyx
0 → 100644
View file @
3f5848fc
cdef
bytes
bytes_string
=
b'hello world'
cdef
char
c
for
c
in
bytes_string
:
if
c
==
'A'
:
print
(
"Found the letter A"
)
docs/examples/tutorial/string/for_unicode.pyx
0 → 100644
View file @
3f5848fc
cdef
unicode
ustring
=
u'Hello world'
# NOTE: no typing required for 'uchar' !
for
uchar
in
ustring
:
if
uchar
==
u'A'
:
print
(
"Found the letter A"
)
docs/examples/tutorial/string/if_char_in.pyx
0 → 100644
View file @
3f5848fc
cpdef
void
is_in
(
Py_UCS4
uchar_val
):
if
uchar_val
in
u'abcABCxY'
:
print
(
"The character is in the string."
)
else
:
print
(
"The character isn't in the string"
)
docs/src/tutorial/strings.rst
View file @
3f5848fc
...
...
@@ -676,22 +676,14 @@ C code::
for c in c_string[:100]:
if c == 'A': ...
The same applies to bytes objects:
:
The same applies to bytes objects:
cdef bytes bytes_string = ...
cdef char c
for c in bytes_string:
if c == 'A': ...
.. literalinclude:: ../../examples/tutorial/string/for_bytes.pyx
For unicode objects, Cython will automatically infer the type of the
loop variable as :c:type:`Py_UCS4`::
cdef unicode ustring = ...
loop variable as :c:type:`Py_UCS4`:
# NOTE: no typing required for 'uchar' !
for uchar in ustring:
if uchar == u'A': ...
.. literalinclude:: ../../examples/tutorial/string/for_unicode.pyx
The automatic type inference usually leads to much more efficient code
here. However, note that some unicode operations still require the
...
...
@@ -704,11 +696,9 @@ loop to enforce one-time coercion before running Python operations on
it.
There are also optimisations for ``in`` tests, so that the following
code will run in plain C code, (actually using a switch statement):
:
code will run in plain C code, (actually using a switch statement):
cdef Py_UCS4 uchar_val = get_a_unicode_character()
if uchar_val in u'abcABCxY':
...
.. literalinclude:: ../../examples/tutorial/string/if_char_in.pyx
Combined with the looping optimisation above, this can result in very
efficient character switching code, e.g. in unicode parsers.
...
...
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