# Python Basics¶

Tomas Beuzen, September 2020

These exercises complement Chapter 1.

## Exercises¶

### 1.¶

What is 5 to the power of 5?

# Your answer here.


### 2.¶

What is the remainder from dividing 73 by 6?

# Your answer here.


### 3.¶

How many times does the whole number 3 go into 123? What is the remainder of dividing 123 by 3?

# Your answer here.


### 4.¶

Split the following string into a list by splitting on the space character:

s = "MDS is going virtual!"



### 5.¶

Given the following variables:

thing = "light"
speed = 299792458  # m/s


Use f-strings to print:

The speed of light is 2.997925e+08 m/s.

# Your answer here.


### 6.¶

Given this nested list, use indexing to grab the word “MDS”:

l = [10, [3, 4], [5, [100, 200, ["MDS"]], 23, 11], 1, 7]



### 7.¶

Given this nest dictionary grab the word “MDS”:

d = {
"outer": [
1,
2,
3,
{"inner": ["this", "is", "inception", {"inner_inner": [1, 2, 3, "MDS"]}]},
]
}



### 8.¶

Why does the following cell return an error?

t = (1, 2, 3, 4, 5)
t[-1] = 6

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-8-d668dd5b8bda> in <module>
1 t = (1, 2, 3, 4, 5)
----> 2 t[-1] = 6

TypeError: 'tuple' object does not support item assignment


### 9.¶

Use string methods to extract the website domain from an email, e.g., from the string "tomas.beuzen@fakemail.com", you should extract "fakemail".

email = "tomas.beuzen@fakemail.com"



### 10.¶

Given the variable language which contains a string, use if/elif/else to write a program that:

• return “I love snakes!” if language is "python" (any kind of capitalization)

• return “Are you a pirate?” if language is "R" (any kind of capitalization)

• else return “What is language?” if language is anything else.

language = "python"



## Solutions¶

### 1.¶

What is 5 to the power of 5?

5 ** 5

3125


### 2.¶

What is the remainder from dividing 73 by 6?

73 % 6

1


### 3.¶

How many times does the whole number 3 go into 123? What is the remainder of dividing 123 by 3?

print(1234 // 3)
print(1234 % 3)

411
1


### 4.¶

Split this string on the space character into a list:

s = "MDS is going virtual!"

s = "MDS is going virtual!"
s.split()

['MDS', 'is', 'going', 'virtual!']


### 5.¶

Given the following variables:

thing = "light"
speed = 299792458  # m/s


Use f-strings to print:

The speed of light is 2.997925e+08 m/s.

thing = "light"
speed = 299792458  # m/s
print(f"The speed of {thing} is {speed:2e} m/s.")

The speed of light is 2.997925e+08 m/s.


### 6.¶

Given this nested list, use indexing to grab the word “MDS”:

l = [10,[3,4],[5,[100,200,['MDS']],23,11],1,7]

l[2][1][2]

['MDS']


### 7.¶

Given this nest dictionary grab the word “MDS”:

d = {
"outer": [
1,
2,
3,
{"inner": ["this", "is", "inception", {"inner_inner": [1, 2, 3, "MDS"]}]},
]
}

d['outer'][3]['inner'][3]['inner_inner'][3]

'MDS'


### 8.¶

Why does the following cell return an error?

t = (1, 2, 3, 4, 5)
t[-1] = 6

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-20-d668dd5b8bda> in <module>
1 t = (1, 2, 3, 4, 5)
----> 2 t[-1] = 6

TypeError: 'tuple' object does not support item assignment


Because tuples are immutable!

### 9.¶

Use string methods to extract the website domain from an email, e.g., from the string "tomas.beuzen@fakemail.com", you should extract "fakemail".

email = "tomas.beuzen@fakemail.com"
email.split("@")[-1].split(".com")[0]

'fakemail'


### 10.¶

Given the variable language which contains a string, use if/elif/else to write a program that:

• return “I love snakes!” if language is "python" (any kind of capitalization)

• return “Are you a pirate?” if language is "R" (any kind of capitalization)

• else return “What is language?” if language is anything else.

language = "python"
if language.lower() == "python":
print("I love snakes!")
elif language.lower() == "r":
print("Are you a pirate?")
else:
print(f"What is {language}?")

I love snakes!