Python Basics

Question 1

Syntax used to concatenate strings

Answer 1

‘a’ + ‘b’

Question 2

Finding the type of a value

Answer 2

type([val])

Question 3

Syntax to define a function

Answer 3

def [function_name](param1, param2):
     code
     return val1, val2

Question 4

Syntax to insert values into a string in order

Answer 4

“France is in {} and China is in {}”.format(“Europe”, “Asia”)

Question 5

Insert values into a string by position

Answer 5

“{0} times {0} equals {1}”.format(3, 9)

Question 6

Insert values into a string by name

Answer 6

“{name}’s population is {pop} million”.format(name=”Brazil, pop=209)

Question 7

Format specification for 2 decimal places

Answer 7

“I own {:.2f}% of the company”.format(32.5548)

Question 8

Format specification for 2 decimal places and comma separator

Answer 8

“Your bank balance is {:,.2f}”.format(12345.678)

Question 9

Define an empty class

Answer 9

class class_name:

pass

Question 10

Instantiate an object of a class

Answer 10

variable = class_name

Question 11

Define an init function in a class to assign an attribute at instantiation

Answer 11

class class_name:
def_init_(self, param1):
self.attribute1 = param1
mc_2 = MyClass(“arg_1”)

Question 12

Import datetime module

Answer 12

import datetime as dt

Question 13

Create datetime.datetime string given a month, year and day

Answer 13

[var] = dt.datetime(1985, 3, 13)

Question 14

Create datetime.datetime object from string

Answer 14

[var] = dt.datetime.strptime(“24/12/1984”, “%d/%m/%Y”)

Question 15

Convert datetime.datetime object to string

Answer 15

dt_object = dt.datetime(1984, 12, 24)
dt_string = dt_object.strftime("%d/%m/%Y")

Question 16

Instantiate a datetime.time object

Answer 16

[var] = datetime.time(hour=0, minute=0, second=0, microsecond=0)

Question 17

Retrieve part of a date stored in the datetime.datetime object

Answer 17

[var].day

Question 18

Create a date from a datetime.datetime object

Answer 18

d2_dt = dt.datetime(1946, 9, 10)
d2 = d2_dt.date()

Question 19

Create a datetime.date object from a string

Answer 19

d3_str = "17 February 1963"
d3_dt = dt.datetime.strptime(d3_str, "%d %B %Y")
d3 = d3_dt.date

Question 20

Instantiate a datetime.timedelta object

Answer 20

eg_4 = dt.timedelta(weeks=3)

Question 21

Add a time period to datetime.datetime object

Answer 21

d1 = dt.date(1963, 2, 26)
d1_plus_1wk = d1 + dt.timedelta(weeks=1)