11  Nurturing Session I

%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

%%file box.py
# your code here

import sys
sys.argv

Writing box.py

%verify_problem text-in-a-box

Found 3 checks
✗ python box.py python
Expected:
+--------+
| python |
+--------+
Found:

✗ python box.py Joy
Expected:
+-----+
| Joy |
+-----+
Found:

✗ python box.py "Joy of Programming"
Expected:
+--------------------+
| Joy of Programming |
+--------------------+
Found:

💥 Oops! Your solution to problem text-in-a-box is incorrect or incomplete.

words = ["one", "two", "three", "four"]

words[1:]

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

%%file box.py
# your code here

import sys
print(sys.argv)

Overwriting box.py

!python box.py hello these are some arguments

['box.py', 'hello', 'these', 'are', 'some', 'arguments']

%%file box.py
# your code here

import sys
print(sys.argv[1:])

Overwriting box.py

!python box.py hello some more args

['hello', 'some', 'more', 'args']

def print_a_box(text):
    pass

print_a_box()

words

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

words

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

words[0]

'one'

text = "one two three four five"

text.split()

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

ones = [1, 1, 1, 1]

" ".join(words)

'one two three four'

%%file box.py
# your code here

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

Overwriting box.py

!python box.py hello this is another execution

hello this is another execution

11.0.1 methods from string

text 

'one two three four five'

text.split(" ")

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

text.split() # if no argument is given it will split on white space

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

"-".join(words) # it assumes that the list that you are passing as argument to join method has all text items in it

'one-two-three-four'

text

'one two three four five'

text.replace("o", "O")

'One twO three fOur five'

'one-two-three-four'.split()

['one-two-three-four']

'one-two-three-four'.split("-")

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

11.0.2 functions

def functioname(x, y):
    return x*y/100

def foo(x, y, z):
    s = (x + y + z)/3
    print(s) # make sure that your function returns

foo(1, 2, 3) == 2.0

2.0

False

def foo(x, y, z):
    s = (x + y + z)/3
    return s # make sure that your function returns

foo(1, 2, 3) == 2.0

True

11.0.3 loops

words

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

text

'one two three four five'

ones

[1, 1, 1, 1]

for i in ones:
    print(i)

1
1
1
1

for w in words:
    print(w)

one
two
three
four

def findwords_of_len(words, n):
    words_ = []
    for w in words:
        if len(w) == n:
            words_.append(w)
    return words_

findwords_of_len(words, 3)

['one', 'two']

findwords_of_len(words, 4)

['four']

"one" in words

True

"one" not in words

False

11.0.4 conversions and methods from string

111.count(1)

  Cell In[48], line 1
    111.count(1)
       ^
SyntaxError: invalid decimal literal

str(111).count(1)

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
Cell In[49], line 1
----> 1 str(111).count(1)

TypeError: must be str, not int

str(111).count("1")

3

text

'one two three four five'

name = "python"

name[1:3] # it will give me substring which start at index 1 and stops at 2

'yt'

name[:] # copy

'python'

name[:2] # start at 0 and end at 1 ... take first two

'py'

name[2:] # drop frist two

'thon'

big = "asdkjahsdjkas sfjkadhfjkjhgsdfa"

big[4:15:2]

'jhdkss'

big[::-1]

'afdsghjkjfhdakjfs sakjdshajkdsa'

name[::-1]

'nohtyp'

nums = [1, 2, 3, 4, 5]

sqr = []
for n in nums:
    sqr.append(n*n)

"="*5

'====='

11.0.5 modules

import string

string.ascii_letters

'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'

string.digits

'0123456789'