Python General Code Syntax

Question 1

x = raw_input()

Answer 1

reads text from standard input and stores the entry into a variable

Question 2

x = raw_input(‘Enter Value’)

Answer 2

prompts user with text in parentheses

Question 3

argv

Answer 3

argument variable

Question 4

var, var1, var2, var3, . . . = argv

Answer 4

unpacks the command line parameter into their respective variables. The first is always the program name (.py file). And the following parameter are loaded into their respective variables

Question 5

import

Answer 5

imports a module into a python program

Question 6

txt = open(filename)

Answer 6

opens a file and returns a file object which is stored in the variable txt.

Question 7

txt.read()

Answer 7

Reads the text stored in the file object referenced by the variable txt.

Question 8

print “some text”

Answer 8

prints text to standard out using double quotes

Question 9

print ‘some text’

Answer 9

prints text to standard out using single quotes

Question 10

print “print it’s text”

Answer 10

prints text to standard out including a single quote

Question 11

python program_name.py

Answer 11

Executes a python program from the terminal

Question 12

some text

Answer 12

An “octothorpe” also known as ‘pound’, ‘hash’, or ‘mesh’ or whatever name makes you chill out!

Question 13

print “ some text %s” % variable_name

Answer 13

Format character for string, replaces the %s with the value stored in ‘variable_name’

Question 14

print “some text %s and %s some more text” % (var_1, var_2)

Answer 14

Format characters for multiple variable, replaces the %s in the order found in the parenthesis.

Question 15

%r

Answer 15

Format character, which returns a result which is valid python syntax using the repr( ) function.

Question 16

print var_x

Answer 16

prints the content of var_x to standard output

Question 17

hilarious = False
joke_eval=”Isn’t that joke funny?! %r”
print joke_eval % hilarious

Answer 17

print out the string ‘joke_eval’ with the repr(hilarious) replacing the %r in the ‘joke_eval’ string

Question 18

print “ print this %s” % ‘Stuff’

Answer 18

prints the string in quotes replacing the format character with the text in the single quotes

Question 19

print “.” * 10

Answer 19

print 10 dots in a row to standard output

Question 20

List

Answer 20

A list is a container of things that are organized in order. A list starts with a left bracket, list of items separated by a comma, and end with a right bracket.

Question 21

list.append(x)

Answer 21

adds an item x to the end of the list

Question 22

list.extend(L)

Answer 22

Extends a list by appending all the items of a given list L

Question 23

list.insert(i, x)

Answer 23

Inserts x into list at index i.

Question 24

list.remove(x)

Answer 24

removes the first item in the list with value x

Question 25

list.pop( [i] )

Answer 25

removes from list the item at index i, if no index is give the last item in the list is removed.

Question 26

list.index(x)

Answer 26

returns the first index in the list with value x

Question 27

list.count(x)

Answer 27

returns the number of times x appears in list

Question 28

list.sort()

Answer 28

sort the items in list, in place

Question 29

list.reverse()

Answer 29

reverse the items in list, in place

Question 30

if - statement

Answer 30

if boolean expression :

indent statements

Question 31

if - else statement

Answer 31

if boolean expression :
indent statements
else:
indent statements

Question 32

if - elif - else statement

Answer 32

if boolean expression:
    indent statements
elif boolean expression:
    indent statements
else:
    indent statements

Question 33

for-loop w/ list

Answer 33

for number in numbers:

print number

Question 34

for-loop w/ range

Answer 34

for i in range(0, 6):

print i

Question 35

while-loop statement

Answer 35

while boolean expression:

indent statements