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34 Cards in this Set
- Front
- Back
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definite loop |
allows user to repeat a number of actions or a sequence multiple times until the loop ends. for in : (->indent) |
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accumulator design pattern |
calculates a sum (or another accumulation) using repetition and arithmetic. It involves three steps: 1. setup accumulator variable 2. use a loop to process inputs/values 3. after the loop, use the accumulated result |
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indefinite loop |
allows user to repeat a number of actions or a sequence multiple times without an end to the loop general form: while : (indent) (indent) (indent) |
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sentinel-controlled loop |
has one value that end collecting inputs. |
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functions |
re-usable pieces of code grouped together and labeled with an identifier. Take parameters as inputs and return values as outputs |
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literals |
hard-coded input ex. print('hello world') |
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expressions |
statements that produce a value ex) 3+ 5 |
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variables |
represents an expression, number ex) x = float(input("enter your favorite number:")) x is the variable. store the number, expression |
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identifiers |
name that refers to a variable ex) amountInPeso |
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print("the ratio of circumference to diameter is %.4f" % math.pi) |
%.4f % math.pi - trigger the numeric formatting %.4f % math.pi - tells how many decimal places to round %.4f % math.pi - indicates that this is a float %.4f % math.pi - indicates the replacement operator. not the remainder %.4f % math.pi - what pi equals the result is the substitution of 3.1456 into string |
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parameters |
the inputs to a function |
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return value |
the outputs of a function |
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objects |
active database that have both data and actions that operate on that data |
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ASCIII codes |
computer stores individual characters of text in these codes where each individual character, non-alphabetical symbols and upper/lower case letters are each assigned a value |
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encoding |
ord() - character to number |
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decoding |
ch() - number to character |
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scalar variable |
a single spot in memory tat can hold 1 value |
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list |
an abstract data type that holds multiple values and supports sequence operations. Are also objects that have useful methods |
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ADT |
stores primitive data types. has operations that allow user to append, delete, insert and view |
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dictionary |
an associative relation of key to value pairs. |
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results of SELECT query |
the data table for the information you requested. it can fetch all data from the table. cursor.fetchall |
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results of DELETE query |
the number of rows of data affected - removed from the requested data. cursor.rowcount |
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JOIN clause |
pulls information from one table and joins it with the information from another table to display data from both because they have a relationship |
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WHERE clause |
pull the specific key you want to obtain |
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web application |
a program (script) that generates a web page dynamically. the application runs every time the web browser loads the page |
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HTML forms |
used to collect user input. contains form elements. send data to the webserver as specified by a parameter called action |
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Common Gateway Interface (CGI) |
application waiting to process a form. requires a non-trivial script on the server to process the data.Python's CGI module provides access to a dict of all form fields and their values:cgi.FieldStorage() functionif form.has_key("NAME"):name = form["NAME"].valueprint hello(name) |
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checklist for resolving INTERNAL SERVER ERRORS |
1. python syntax error - do "run/check module" within IDLE and fix all errors 2. Missing or incorrect shebang line; should be: #!usr/bin/python 3. incorrect permissions: should be 755 4. missing HTTP headers (ie. "Content-type: text/html" followed by print 5. smart quotes are NOT valid ASCII characters. must be " " and ' ' |
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HTML links |
enables us to create hypertext references (links) - text or an image you can click on and jump to another document general format: < a href="bu.edu" > BU web page |
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HTML |
hypertext markup language that are scripts of codes used to create web servers. HTML has tags that are keywords surrounded by angle brackets contains different elements to generate web applications that allow users to interact with web server |
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shebang line |
#!/usr/bin/python a directive to tell the web server where to find the python interpreted |
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main section of the program |
if statement: if_ _name_ _==_ _"main_ _": |
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name attribute |
HTML form fields identified at the server. it is important because they are referred to later in the main section |
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Action attribute |
element of the form associates the form with the web application. there is a URL that connects the HTML form with web application |
