Problem 1: Flatten the list

Module 1 - Nurturing session

How to take inputs from user?

x = input("Enter value for x:") # any value that you enter using input function is text

Enter value for x: 10

'10'

int(x) # ths has to be done manually

Another way, command line arguments

%%file say_hello.py
import sys

# argv variable inside sys module will have all the commandline arguments that you pass from commandline
sys.argv

print(sys.argv)

Writing say_hello.py

%%file say_hello.py
import sys

# argv variable inside sys module will have all the commandline arguments that you pass from commandline
sys.argv

print("Hello", sys.argv[1])

Overwriting say_hello.py

!python say_hello.py arcesium

Hello arcesium

%load_problem text-in-a-box

Problem: Text in a Box

Write a program box.py that takes word as a command-line argument and prints the word in a box as shown below.

$ python box.py python
+--------+
| python |
+--------+

Please note that there should be exactly one space on either side of the text in the box.

You can verify your solution using:

%verify_problem text-in-a-box

%%file box.py
# your code here
import sys

def print_a_box1(word):
    dashcount = len(word)+2
    line1 = "+" +  "-"*dashcount + "+"
    line2 = "| " + word + " |"
    print(line1)
    print("|",word,"|")
    print(line1)

word = sys.argv[1] # get the word from command line 

print_a_box1(word) # call the function with that word as argument

Overwriting box.py

!python box.py hello

+-------+
| hello |
+-------+

def print_a_box(word):
    dashcount = len(word)+2
    line1 = "+" +  "-"*dashcount + "+"
    line2 = "| " + word + " |"
    print(line1)
    print(line2)
    print(line1)

def print_a_box1(word):
    dashcount = len(word)+2
    line1 = "+" +  "-"*dashcount + "+"
    line2 = "| " + word + " |"
    print(line1)
    print("|",word,"|")
    print(line1)

print_a_box("Python")

+--------+
| Python |
+--------+

print_a_box1("Python")

+--------+
| Python |
+--------+

%verify_problem text-in-a-box

✓ python box.py python
✓ python box.py Joy
✓ python box.py "Joy of Programming"
🎉 Congratulations! You have successfully solved problem text-in-a-box!!

!python box.py Arcesium

+----------+
| Arcesium |
+----------+

%load_problem mean

Problem: Mean

Write a function mean to compute the arthematic mean of a list of numbers.

The arthemetic mean of N numbers is computed by adding all the N numbers and dividing the total by N.

The function takes the list of numbers as argument and returns the mean.

>>> mean([1, 2, 3, 4, 5])
3.0

You can verify your solution using:

%verify_problem mean

# your code here

def mean(nums):
    m = sum(nums)/len(nums)
    print(m) # it should return

mean([1, 2, 3, 4, 5])

3.0

%verify_problem mean

3.0
✗ mean([1, 2, 3, 4, 5])
  expected: 3.0
  found: None
5.0
✗ mean([5])
  expected: 5.0
  found: None
💥 Oops! Your solution to problem mean is incorrect or incomplete.

x = mean([1, 2, 3, 4, 5, 6])

3.5

print(x)

None

Any function that does not return a value, actually returns None

Flatten the list

items = [[1, 1, 2], [2, 3, 4], [2,3]]

empty = []

empty.extend(items[0])

empty

[1, 1, 2]

for item in items:
    empty.extend(item)

for loop

nums = range(10)
words = ["one", "two", "three", "four"]

for w in words:
    print(w.upper())

ONE
TWO
THREE
FOUR

Unique

items = [1, 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4]

if "one" in words:
    print("one is in words!")

one is in words!

unique = []
for item in items:
    if item not in unique:
        unique.append(item)

unique

[1, 2, 3, 4]

minimum3

x, y = 5, 6

def min2(x, y):
    if x < y:
        return x
    else:
        return y

min2(56, 3)

min2(-1, -43)

-43

43%2

42%2

def even(n):
    return n%2==0

even(42)

True

How to take multipule arguments

%%file args.py
import sys

print(sys.argv[1])

Writing args.py

!python args.py

Traceback (most recent call last):
  File "/home/jupyter-vikrant/arcesium-python-2024/args.py", line 3, in <module>
    print(sys.argv[1])
IndexError: list index out of range

!python args.py arg1

arg1

words

['one', 'two', 'three', 'four']

words[1]

'two'

words[1:]

['two', 'three', 'four']

%%file args.py
import sys

print(sys.argv[1:])

Overwriting args.py

!python args.py I want to give this sentence

['I', 'want', 'to', 'give', 'this', 'sentence']

%%file args.py
import sys

print(" ".join(sys.argv[1:]))

Overwriting args.py

!python args.py I want to give this sentence

I want to give this sentence

%%file single_arg.py
import sys

print(sys.argv[1])

Writing single_arg.py

!python single_arg.py A sentence like this will not work

!python single_arg.py "A sentence like this will not work"

A sentence like this will not work