Python

Question 1

read()

Answer 1

The read() method returns the specified number of bytes from the file. Default is -1 which means the whole file.

f = open(“demofile.txt”, “r”)
print(f.read())

Question 2

close()

Answer 2

The close() method closes an open file.

You should always close your files, in some cases, due to buffering, changes made to a file may not show until you close the file.

Question 3

readline()

Answer 3

The readline() method returns one line from the file.

You can also specified how many bytes from the line to return, by using the size parameter.

The number of bytes from the line to return. Default -1, which means the whole line.

f = open(“demofile.txt”, “r”)
print(f.readline())

Question 4

truncate

Answer 4

empties the file

The truncate() method resizes the file to the given number of bytes.

If the size is not specified, the current position will be used.

f = open(“demofile2.txt”, “a”)

f. truncate(20)
f. close()

Question 5

write(‘stuff’)

Answer 5

writes “stuff” to the file

The write() method writes a specified text to the file.

Where the specified text will be inserted depends on the file mode and stream position.

“a”: The text will be inserted at the current file stream position, default at the end of the file.

“w”: The file will be emptied before the text will be inserted at the current file stream position, default 0

f = open(“demofile2.txt”, “a”)

f. write(“See you soon!”)
f. close()

Question 6

seek(0)

Answer 6

moves the read/write location to the beginning of the file

Question 7

print

Answer 7

The print() function prints the specified message to the screen, or other standard output device.

The message can be a string, or any other object, the object will be converted into a string before written to the screen.

Question 8

(

Answer 8

opening parenthesis

Question 9

)

Answer 9

closing parenthesis

Question 10

#

Answer 10

Use ‘hashtag’ or ‘pound’ for commenting

Question 11

+

Answer 11

plus sign. addition

Question 12

/

Answer 12

slash. division

Question 13

>

Answer 13

grater than

Answer 14

less than

Question 15

’

Answer 15

single quote

Question 16

*

Answer 16

asterisk. multiplication

Question 17

”

Answer 17

double quote. defines beginning and end of strings

Question 18

’’’

Answer 18

triple simple quote. for opening multiple lines of text

Question 19

{}

Answer 19

curly brackets. variables inside strings

Question 20

[]

Answer 20

square brackets. for building lists

Question 21

format()

Answer 21

passes arguments filling placeholders marked as {}

Question 22

\n

Answer 22

new line

Question 23

\t

Answer 23

tab (indents in string)

Question 24

import

Answer 24

imports a module

Question 25

argv

Answer 25

module that requests an argument to function

Question 26

int()

Answer 26

converts string into an integer

Question 27

float()

Answer 27

converts a string into a number with decimal

Question 28

input()

Answer 28

request input from user

Question 29

open()

Answer 29

The open() function opens a file, and returns it as a file object.

open(“demofile.txt”, “r”)

Question 30

truncate()

Answer 30

The truncate() method resizes the file to the given number of bytes.

If the size is not specified, the current position will be used.

file.truncate(size)

Question 31

def

Answer 31

defines a function. this is how every function should begin/

def name_of_function(argument1, argument2):

Question 32

readline()

Answer 32

The readline() method returns one line from the file.

You can also specified how many bytes from the line to return, by using the size parameter.

file.readline(size)