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| author | Senthil Kumaran <senthil@uthcode.com> | 2012-03-14 02:47:51 (GMT) |
|---|---|---|
| committer | Senthil Kumaran <senthil@uthcode.com> | 2012-03-14 02:47:51 (GMT) |
| commit | 21c71bac5f684b0ec1665d841d05f91e078c3964 (patch) | |
| tree | 57a3a7d2de94d8e35cc588fd04a270e102fae55b /Doc/library | |
| parent | 817dd91595d202e9582435430b98ba65d14d14a7 (diff) | |
| download | cpython-21c71bac5f684b0ec1665d841d05f91e078c3964.zip cpython-21c71bac5f684b0ec1665d841d05f91e078c3964.tar.gz cpython-21c71bac5f684b0ec1665d841d05f91e078c3964.tar.bz2 | |
closes Issue12365 - Add an example explaining the context manager use case of urllib.urlopen
Diffstat (limited to 'Doc/library')
| -rw-r--r-- | Doc/library/urllib.request.rst | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/Doc/library/urllib.request.rst b/Doc/library/urllib.request.rst index cc759a4..b51ce3f 100644 --- a/Doc/library/urllib.request.rst +++ b/Doc/library/urllib.request.rst @@ -46,8 +46,8 @@ The :mod:`urllib.request` module defines the following functions: If neither *cafile* nor *capath* is specified, an HTTPS request will not do any verification of the server's certificate. - This function returns a file-like object with two additional methods from - the :mod:`urllib.response` module + This function returns a file-like object that works as a :term:`context manager`, + with two additional methods from the :mod:`urllib.response` module * :meth:`geturl` --- return the URL of the resource retrieved, commonly used to determine if a redirect was followed @@ -967,8 +967,17 @@ The following W3C document, http://www.w3.org/International/O-charset , lists the various ways in which a (X)HTML or a XML document could have specified its encoding information. -As python.org website uses *utf-8* encoding as specified in it's meta tag, we -will use same for decoding the bytes object. :: +As the python.org website uses *utf-8* encoding as specified in it's meta tag, we +will use the same for decoding the bytes object. :: + + >>> with urllib.request.urlopen('http://www.python.org/') as f: + ... print(f.read(100).decode('utf-8')) + ... + <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" + "http://www.w3.org/TR/xhtml1/DTD/xhtm + +It is also possible to achieve the same result without using the +:term:`context manager` approach. :: >>> import urllib.request >>> f = urllib.request.urlopen('http://www.python.org/') @@ -976,7 +985,6 @@ will use same for decoding the bytes object. :: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtm - In the following example, we are sending a data-stream to the stdin of a CGI and reading the data it returns to us. Note that this example will only work when the Python installation supports SSL. :: |