## First Assignment

#### 1) Apply the appropriate string methods to the **x** variable (as '.upper') to change it exactly to: "$Dichlorodiphenyltrichloroethane$".


```python
x = "DiClOrod  IFeNi  lTRicLOr oETaNo  DiChlorod iPHeny lTrichL oroEThaNe"
```


```python
answer = x[x.find('DiChl'):].replace(" ","").capitalize()
print(answer)
```

    Dichlorodiphenyltrichloroethane


#### 2) Assign respectively the values: 'word', 15, 3.14 and 'list' to variables A, B, C and D in a single line of code. Then, print them in that same order on a single line separated by a space, using only one print statement.


```python
A, B, C, D = 'word', 15, 3.14, 'list'
print(A,B,C,D,sep=" ")

# Other option:
#print(f"{A} {B} {C} {D}")
```

    word 15 3.14 list


#### 3) Use the **input()** function to receive an input in the form **'68.4 1.71'**, that is, two floating point numbers in a line separated by space. Then, assign these numbers to the variables **w** and **h** respectively, which represent an individual's weight and height (hint: take a look at the '.split()' method). With this data, calculate the individual's Body Mass Index (BMI) from the following relationship: 
    
\begin{equation}
BMI = \dfrac{weight}{height^2}
\end{equation}


```python
w,h = input("Enter your weight and height, respectively, separated by a space: ").split()
BMI = float(w)/float(h)**2
print(BMI)
```

    Enter your weight and height, respectively, separated by a space:  73 1.83


    21.798202394816204


#### This value can also be classified according to ranges of values, following to the table below. Use conditional structures to classify and print the classification assigned to the individual. 

<center><\center>  


(source: https://healthtravelguide.com/bmi-calculator/)


```python
if BMI <= 18.5:
    print("underweight")
elif BMI <= 24.9:
    print("normal weight")
elif BMI <= 29.9:
    print("pre-obesity")
elif BMI <= 34.9:
    print("Obesity class I")
elif BMI <= 39.9:
    print("Obesity class II")
else:
    print("Obesity class III")
```

    normal weight


#### 4) Receive an integer as an input and, using a loop, calculate the factorial of this number, that is, the product of all the integers from one to the number provided. 


```python
num = int(input("Enter an integer: "))
fact = 1
for i in range(1,num+1):
    fact *= i # Equivalent to fact = fact * i
print(f"{num}! = {fact}")
```

    Enter an integer:  12


    12! = 479001600


#### 5) Using a while loop and the input function, read an indefinite number of integers until the number read is -1. Present the sum of all these numbers in the form of a print, excluding the -1 read at the end. 


```python
sum_numbers, number = 0, 0
while number != -1:
    sum_numbers += number
    number = int(input("Enter an integer: "))
print(f"Sum of numbers = {sum_numbers}")
```

    Enter an integer:  12
    Enter an integer:  23
    Enter an integer:  12
    Enter an integer:  98
    Enter an integer:  23
    Enter an integer:  12
    Enter an integer:  -1


    Sum of numbers = 180


#### 6) Read the **first name** of an employee, his **amount of hours worked** and the **salary per hour** in a single line separated by commas. Next, calculate the **total salary** for this employee and show it to two decimal places.


```python
name, hours_wk, hour_sal = input("Insert name, amount of hours worked and salary per hour, separated by commas: ").split(",")
total_sal = float(hours_wk)*float(hour_sal)
print('{:.2f}'.format(total_sal))
```

    Insert name, amount of hours worked and salary per hour separated by commas:  James, 23, 100


    2300.00


#### 7) Read three floating point values **A**, **B** and **C** respectively. Then calculate itens a, b, c, d and e: 


```python
A, B, C = [float(x) for x in input("Insert A, B and C").split(",")]
# a, b, c = input().split(",")
# A, B, C = float(a), float(b), float(c)
```

    Insert A, B and C 3,2,5


    a) the area of the triangle rectangle with A as the base and C as the height.


```python
print("Area:", A*C/2)
```

    Area: 7.5


    b) the area of the circle of radius C. (pi = 3.14159) 


```python
print("Area:", 3.14159*C**2)
```

    Area: 78.53975


    c) the area of the trapezoid that has A and B for bases and C for height. 


```python
print("Area:", (A+B)*C/2)
```

    Area: 12.5


    d) the area of the square that has side B. 


```python
print("Area:", B**2)
```

    Area: 4.0


    e) the area of the rectangle that has sides A and B. 


```python
print("Area:", A*B)
```

    Area: 6.0


#### 8) Read **the values a, b and c** and calculate the **roots of the second degree equation** $ax^{2}+bx+c=0$ using [this formula](https://en.wikipedia.org/wiki/Quadratic_equation). If it is not possible to calculate the roots, display the message **“There are no real roots”**. 


```python
a, b, c = [float(x) for x in input("Enter a, b and c separated by commas: ").split(",")]
if a == 0:
    print("'a' should not be equal to zero!")
else:
    delta = (b**2) - (4*a*c)
    if delta < 0:
        print("no real roots")
    elif delta == 0:
        x = -b/(2*a)
        print(f"Root: {x}")
    else:
        #Reminder: sqrt(n) = n^(1/2)
        x1 = (-b+delta**0.5)/(2*a)
        x2 = (-b-delta**0.5)/(2*a)
        print(f"Roots: {x1}, {x2}")
```

    Enter a, b and c separated by commas:  2,1,-4


    Roots: 1.1861406616345072, -1.6861406616345072


#### 9) Read four floating point numerical values corresponding to the coordinates of two geographical coordinates in the cartesian plane. Each point will come in a line with its coordinates separated by commas. Then calculate and show the distance between these two points. 

(obs: $d=\sqrt{(x_1-x_2)^2 + (y_1-y_2)^2}$)


```python
x1, y1 = [float(i) for i in input("Enter coordinates x1 and y1: ").split(",")]
x2, y2 = [float(i) for i in input("Enter coordinates x2 and y2: ").split(",")]
d = ((x1-x2)**2+(y1-y2)**2)**0.5
print(f"d = {d}")
```

    Enter coordinates x1 and y1:  3,5
    Enter coordinates x2 and y2:  2,6


    d = 1.4142135623730951


#### 10) Read **two floating point numbers** on a line that represent **coordinates of a cartesian point**. With this, use **conditional structures** to determine if you are at the origin, printing the message **'origin'**; in one of the axes, printing **'x axis'** or **'y axis'**; or in one of the four quadrants, printing **'q1'**, **'q2**', **'q3'** or **'q4'**. 


```python
x, y = [float(x) for x in input("Insert x e y: ").split(",")]

if x == 0 and y == 0:
    print('origin')
elif x == 0:
    print('y axis')
elif y == 0:
    print('x axis')
elif x > 0 and y > 0:
    print('q1')
elif x > 0:
    print('q4')
elif y > 0:
    print('q2')
else:
    print('q3')
```

#### 11) Read an integer that represents a phone code for international dialing.  
#### Then, inform to which country the code belongs to, considering the generated table below:
(You just need to consider the first 10 entries)  


```python
import pandas as pd
df = pd.read_html('https://en.wikipedia.org/wiki/Telephone_numbers_in_Europe')[1]
df = df.iloc[:,:2]
df.head(20)
```




<div>
<style scoped>
    .dataframe tbody tr th:only-of-type {
        vertical-align: middle;
    }

    .dataframe tbody tr th {
        vertical-align: top;
    }

    .dataframe thead th {
        text-align: right;
    }
</style>
<table border="1" class="dataframe">
  <thead>
    <tr style="text-align: right;">
      <th></th>
      <th>Country</th>
      <th>Country calling code</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <th>0</th>
      <td>Austria</td>
      <td>43</td>
    </tr>
    <tr>
      <th>1</th>
      <td>Belgium</td>
      <td>32</td>
    </tr>
    <tr>
      <th>2</th>
      <td>Bulgaria</td>
      <td>359</td>
    </tr>
    <tr>
      <th>3</th>
      <td>Croatia</td>
      <td>385</td>
    </tr>
    <tr>
      <th>4</th>
      <td>Cyprus</td>
      <td>357</td>
    </tr>
    <tr>
      <th>5</th>
      <td>Czech Republic</td>
      <td>420</td>
    </tr>
    <tr>
      <th>6</th>
      <td>Denmark</td>
      <td>45</td>
    </tr>
    <tr>
      <th>7</th>
      <td>Estonia</td>
      <td>372</td>
    </tr>
    <tr>
      <th>8</th>
      <td>Finland</td>
      <td>358</td>
    </tr>
    <tr>
      <th>9</th>
      <td>France</td>
      <td>33</td>
    </tr>
    <tr>
      <th>10</th>
      <td>Germany</td>
      <td>49</td>
    </tr>
    <tr>
      <th>11</th>
      <td>Greece</td>
      <td>30</td>
    </tr>
    <tr>
      <th>12</th>
      <td>Hungary</td>
      <td>36</td>
    </tr>
    <tr>
      <th>13</th>
      <td>Iceland</td>
      <td>354</td>
    </tr>
    <tr>
      <th>14</th>
      <td>Ireland</td>
      <td>353</td>
    </tr>
    <tr>
      <th>15</th>
      <td>Italy</td>
      <td>39</td>
    </tr>
    <tr>
      <th>16</th>
      <td>Latvia</td>
      <td>371</td>
    </tr>
    <tr>
      <th>17</th>
      <td>Liechtenstein</td>
      <td>423</td>
    </tr>
    <tr>
      <th>18</th>
      <td>Lithuania</td>
      <td>370</td>
    </tr>
    <tr>
      <th>19</th>
      <td>Luxembourg</td>
      <td>352</td>
    </tr>
  </tbody>
</table>
</div>




```python
ccode = int(input("Enter the country calling code:"))
code_dict = {43:'Austria',
             32:'Belgium',
             359:'Bulgaria',
             385:'Croatia',
             357:'Cyprus',
             420:'Czech Republic',
             45:'Denmark',
             372:'Estonia',
             359:'Finland',
             33:'France',
            }
if ccode in code_dict.keys():
    print(code_dict[ccode])
else:
    print('Code not recognized.')
```

    Enter the country calling code: 43


    Austria


#### 12) Write a piece of code that reads 6 numbers in a row. Next, show the number of positive values entered. On the next line, print the average of the values to one decimal place. 


```python
responses = [float(x) for x in input("Enter six values separated by commas: ").split(",")]

pos, total = 0, 0
for i in responses:
    total += i
    if i > 0:
        pos += 1
print(f"{pos} positive numbers")
print(f"Average = {total/6}")
```

    Enter six values separated by commas:  3,-4,98,1,-4,5


    4 positive numbers
    Average = 16.5


#### 13) Read an integer **N**. Then print the **square of each of the even values**, from 1 to N, including N, if applicable, arranged one per line. 


```python
N = int(input("Enter number N: "))
for i in range(1,N+1):
    if i%2==0:
        print(i**2)
```

    Enter number N:  20


    4
    16
    36
    64
    100
    144
    196
    256
    324
    400


#### 14) Using **input()**, read an integer and print its classification as **'even / odd'** and **'positive / negative'** . The two classes for the number must be printed on the same line separated by a space. In the case of zero, print only **'null'**. 


```python
number = int(input('Enter an integer: '))
class1 = "even" if number%2 == 0 else "odd"
class2 = 'positive' if number == abs(number) else 'negative' 
if number == 0:
    print("Null")
else:
    print(class1, class2)
```

    Enter an integer:  23


    odd positive


## Challenge
#### 15) Ordering problems are recurrent in the history of programming. Over time, several algorithms have been developed to fulfill this function. The simplest of these algorithms is the [**Bubble Sort**](https://en.wikipedia.org/wiki/Bubble_sort), which is based on comparisons of elements two by two in a loop of passes through the elements. Your mission, if you decide to accept it, will be to input six whole numbers ramdonly ordered. Then implement the **Bubble Sort** principle to order these six numbers **using only loops and conditionals**.  
#### At the end, print the six numbers in ascending order on a single line separated by spaces. 


```python
numbers = [int(x) for x in input("Enter any 6 integers: ").split(",")]
changed = True
while changed:
    changed = False
    for i in range(0,len(numbers)-1):
        if numbers[i] > numbers[i+1]:
            numbers[i],numbers[i+1] = numbers[i+1],numbers[i]
#           aux = numbers[i]                                        #alternative way of doing
#           numbers[i] = numbers[i+1]
#           numbers[i+1] = aux
            changed = True
print(' '.join([str(x) for x in numbers]))
```

    Enter any 6 integers:  4,6,1,4,6,9


    1 4 4 6 6 9



```python

```

91d00132ff3aefabfa91b317c49ef4534e625997
ipynb
Jupyter Notebook
Assignments/Assignment_1_solutions.ipynb
pavelcristina/Python_Course
a02c3acfaa73d009c31107dd8a0c1f0c6107862a
Apache-2.0
2022-01-03T18:20:33.000Z
2022-01-03T18:20:33.000Z
Assignments/Assignment_1_solutions.ipynb
pavelcristina/Python_Course
a02c3acfaa73d009c31107dd8a0c1f0c6107862a
Apache-2.0
Assignments/Assignment_1_solutions.ipynb
pavelcristina/Python_Course
a02c3acfaa73d009c31107dd8a0c1f0c6107862a
Apache-2.0
2022-01-03T18:14:19.000Z
2022-01-03T18:14:19.000Z
Qwen/Qwen-72B
1. YES
2. YES