Average Weight of Deliveries |2|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Suppose a shipping company needs your help to analyze the recorded
weights of their deliveries and calculate the average weights within a
range.

Write a function named *average_weight* which gets a *string* as a file
name where the weights are recorded as *integers* separated with a blank
character in multiple lines. This function must return a *float* which
is the average for the deliveries weighted in the range of **[45, 125]**
kilograms. If there is no recorded delivery in the given range, the
function must return 0.

*Hint:* You can use built-in *map*\ () and *filter()* functions.

.. container:: sampleio

   Sample I/O:

.. |2| image:: ../../figures/difficulty_one.png
   :class: difficulty

.. code:: default

   Sample function call:  
       average_weight("input.txt")  

   Content of the file "input.txt":  
       61 49 92 159 212 257 107 320
       237 282 354 240 120 330 243
       95 113 300 114 271
       191 303 396 117 175 350

   Return value:
       96.444444

.. raw:: html

   <button type="button" class="collapsible" onclick="toggle()">

Show the Answer

.. raw:: html

   </button>

.. raw:: html

   <div class="hiddenanswer">

.. code:: python

   def average_weight(input_path):
       min_weight = 45
       max_weight = 125
       weights_in_range = []
       input_file = open(input_path, 'r')    # open input file in read mode
       for line in input_file.readlines():
           all_weights = list(map(int,list(line.split())))   # getting integer values in a line.
           filtered = list(filter(lambda x: int(x) >= min_weight and int(x) <= max_weight, all_weights))   # filtering the weights
           weights_in_range += filtered

       input_file.close()    # do not forget to close

       count = 0
       total = 0
       for w in weights_in_range:
           total += w
           count += 1
       if count:
           return (total / count)
       else:
           return 0

.. raw:: html

   </div>