    # Cara menggunakan one line calculator python

Last update on August 19 2022 21:50:49 (UTC/GMT +8 hours)

## Python Basic: Exercise-66 with Solution

Write a Python program to calculate body mass index.

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Pictorial Presentation: Sample Solution:-

Python Code:

``````height = float(input("Input your height in Feet: "))
weight = float(input("Input your weight in Kilogram: "))
print("Your body mass index is: ", round(weight / (height * height), 2))
```
```

Sample Output:

```Input your height in Feet:  6
Input your weight in Kilogram:  65
Your body mass index is:  1.81
```

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In this article, we will see how to create a countdown timer using Python. The code will take input from the user regarding the length of the countdown in seconds. After that, a countdown will begin on the screen of the format ‘minutes: seconds’. We will use the time module here.

### Approach

In this project, we will be using the time module and its sleep() function. Follow the below steps to create a countdown timer:

• Step 1: Import the time module.
• Step 2: Then ask the user to input the length of the countdown in seconds.
• Step 3: This value is sent as a parameter ‘t’ to the user-defined function countdown(). Any variable read using the input function is a string. So, convert this parameter to ‘int’ as it is of string type.
• Step 4: In this function, a while loop runs until time becomes 0.
• Step 5: Use divmod() to calculate the number of minutes and seconds. You can read more about it here.
• Step 6: Now print the minutes and seconds on the screen using the variable timeformat.
• Step 7: Using end = ‘\r’ we force the cursor to go back to the start of the screen (carriage return) so that the next line printed will overwrite the previous one.
• Step 8: The time.sleep()is used to make the code wait for one sec.
• Step 9: Now decrement time so that the while loop can converge.
• Step 10: After the completion of the loop, we will print “Fire in the hole” to signify the end of the countdown.

Below is the implementation of the above approach

## Python3

`import` `time`

`def` `countdown(t):`

`    ``while` `t:`

`        ``mins, secs ``=` `divmod``(t, ``60``)`

`        ``timer ``=` `'{:02d}:{:02d}'``.``format``(mins, secs)`

`        ``print``(timer, end``=``"\r"``)`

`        ``time.sleep(``1``)`

`        ``t ``-``=` `1`

`    ``print``(``'Fire in the hole!!'``)`

`t ``=` `input``(``"Enter the time in seconds: "``)`

`countdown(``int``(t))`

Output: 