Lists

Question 1

How to define a list?

Answer 1

list = [10, Haus, 55, Katze] (mix between INT / string)

Question 2

How to add a single item to the list?

Answer 2

list.append(50)

Question 3

How to add multiple items to a list?

Answer 3

list.extend(50,60,70)

Question 4

Item count in a list?

Answer 4

len(list)

Question 5

How to remove item from a list?

Answer 5

list.pop(0)

Question 6

How to define a 2-D list?

Answer 6

matrix = [[1, 2, 3],
[4, 5, 6],
[7, 8, 9]]

Question 7

matrix = [[1, 2, 3],
[4, 5, 6],
[7, 8, 9]]

How to access “2” or “4”?

Answer 7

matrix[0][1]

matrix[1][0]

Question 8

How do you define a dictionary?

Answer 8

person = {‘Name’: “Fergus”,
‘Age’: 34,
‘Skills’: [“Python”, “Perl”, “SQL”]
}

Question 9

person = {‘Name’: “Fergus”,
‘Age’: 34,
‘Skills’: [“Python”, “Perl”, “SQL”]
​}

How to access items?

Answer 9

person[‘Name’] # returns “Fergus”
person[‘Age’] # returns “34”

Question 10

Dictionaries: How to return…
all keys
all items
all keys & items

Answer 10

dict. keys()
dict. values()
dict. items()

Question 11

How to add a new item in position 0?

Answer 11

list.insert(0,newitem)

Question 12

How to update an item to a dictionary?

Answer 12

my_dict[‘key1’] = my_dict[‘key1’] - 123

Question 13

How to add an item to a dictionary?

Answer 13

mydict[‘key’] = ipaddr

Question 14

How to print out whole dictionary in pairs?

Answer 14

for key in my_ips.keys():
print(key + “\t” + str(my_ips[key]))

Question 15

How to check if key is already present in dictionary?

Answer 15

if ipadr in my_ips.keys():
do something….