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Fix up indentation of examples to use 4 spaces instead of tabs.
This commit is contained in:
Guido van Rossum
parent
17e973cb32
commit
20e4210ec4
2 changed files with 118 additions and 118 deletions
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@ -40,8 +40,8 @@ telling the client what kind of data is following. Python code to
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generate a minimal header section looks like this:
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\begin{verbatim}
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print "Content-type: text/html" # HTML is following
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print # blank line, end of headers
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print "Content-type: text/html" # HTML is following
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print # blank line, end of headers
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\end{verbatim}
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The second section is usually HTML, which allows the client software
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@ -49,9 +49,9 @@ to display nicely formatted text with header, in-line images, etc.
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Here's Python code that prints a simple piece of HTML:
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\begin{verbatim}
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print "<TITLE>CGI script output</TITLE>"
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print "<H1>This is my first CGI script</H1>"
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print "Hello, world!"
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print "<TITLE>CGI script output</TITLE>"
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print "<H1>This is my first CGI script</H1>"
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print "Hello, world!"
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\end{verbatim}
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(It may not be fully legal HTML according to the letter of the
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@ -77,16 +77,16 @@ dictionary. For instance, the following code (which assumes that the
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the fields \code{name} and \code{addr} are both set to a non-empty string:
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\begin{verbatim}
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form = cgi.FieldStorage()
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form_ok = 0
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if form.has_key("name") and form.has_key("addr"):
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if form["name"].value != "" and form["addr"].value != "":
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form_ok = 1
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if not form_ok:
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print "<H1>Error</H1>"
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print "Please fill in the name and addr fields."
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return
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...further form processing here...
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form = cgi.FieldStorage()
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form_ok = 0
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if form.has_key("name") and form.has_key("addr"):
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if form["name"].value != "" and form["addr"].value != "":
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form_ok = 1
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if not form_ok:
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print "<H1>Error</H1>"
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print "Please fill in the name and addr fields."
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return
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...further form processing here...
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\end{verbatim}
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Here the fields, accessed through \code{form[key]}, are themselves instances
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@ -101,20 +101,20 @@ instance or a list of instances. For example, here's code that
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concatenates any number of username fields, separated by commas:
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\begin{verbatim}
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username = form["username"]
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if type(username) is type([]):
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# Multiple username fields specified
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usernames = ""
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for item in username:
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if usernames:
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# Next item -- insert comma
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usernames = usernames + "," + item.value
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else:
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# First item -- don't insert comma
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usernames = item.value
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else:
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# Single username field specified
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usernames = username.value
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username = form["username"]
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if type(username) is type([]):
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# Multiple username fields specified
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usernames = ""
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for item in username:
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if usernames:
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# Next item -- insert comma
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usernames = usernames + "," + item.value
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else:
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# First item -- don't insert comma
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usernames = item.value
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else:
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# Single username field specified
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usernames = username.value
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\end{verbatim}
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If a field represents an uploaded file, the value attribute reads the
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@ -124,14 +124,14 @@ file attribute. You can then read the data at leasure from the file
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attribute:
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\begin{verbatim}
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fileitem = form["userfile"]
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if fileitem.file:
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# It's an uploaded file; count lines
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linecount = 0
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while 1:
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line = fileitem.file.readline()
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if not line: break
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linecount = linecount + 1
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fileitem = form["userfile"]
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if fileitem.file:
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# It's an uploaded file; count lines
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linecount = 0
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while 1:
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line = fileitem.file.readline()
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if not line: break
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linecount = linecount + 1
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\end{verbatim}
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The file upload draft standard entertains the possibility of uploading
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@ -252,7 +252,7 @@ that the first line of the script contains \code{\#!} starting in column 1
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followed by the pathname of the Python interpreter, for instance:
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\begin{verbatim}
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#!/usr/local/bin/python
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#!/usr/local/bin/python
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\end{verbatim}
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Make sure the Python interpreter exists and is executable by ``others''.
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@ -274,9 +274,9 @@ default module search path, you can change the path in your script,
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before importing other modules, e.g.:
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\begin{verbatim}
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import sys
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sys.path.insert(0, "/usr/home/joe/lib/python")
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sys.path.insert(0, "/usr/local/lib/python")
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import sys
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sys.path.insert(0, "/usr/home/joe/lib/python")
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sys.path.insert(0, "/usr/local/lib/python")
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\end{verbatim}
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(This way, the directory inserted last will be searched first!)
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@ -312,7 +312,7 @@ in the standard \code{cgi-bin} directory, it should be possible to send it a
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request by entering a URL into your browser of the form:
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\begin{verbatim}
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http://yourhostname/cgi-bin/cgi.py?name=Joe+Blow&addr=At+Home
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http://yourhostname/cgi-bin/cgi.py?name=Joe+Blow&addr=At+Home
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\end{verbatim}
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If this gives an error of type 404, the server cannot find the script
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@ -329,9 +329,9 @@ The next step could be to call the \code{cgi} module's test() function from
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your script: replace its main code with the single statement
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\begin{verbatim}
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cgi.test()
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cgi.test()
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\end{verbatim}
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This should produce the same results as those gotten from installing
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the \code{cgi.py} file itself.
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@ -364,16 +364,16 @@ Here are the rules:
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For example:
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\begin{verbatim}
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import sys
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import traceback
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print "Content-type: text/html"
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print
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sys.stderr = sys.stdout
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try:
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...your code here...
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except:
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print "\n\n<PRE>"
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traceback.print_exc()
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import sys
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import traceback
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print "Content-type: text/html"
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print
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sys.stderr = sys.stdout
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try:
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...your code here...
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except:
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print "\n\n<PRE>"
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traceback.print_exc()
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\end{verbatim}
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Notes: The assignment to \code{sys.stderr} is needed because the traceback
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@ -385,11 +385,11 @@ module, you can use an even more robust approach (which only uses
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built-in modules):
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\begin{verbatim}
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import sys
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sys.stderr = sys.stdout
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print "Content-type: text/plain"
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print
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...your code here...
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import sys
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sys.stderr = sys.stdout
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print "Content-type: text/plain"
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print
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...your code here...
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\end{verbatim}
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This relies on the Python interpreter to print the traceback. The
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