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module5_BMI_calculator.py

+import numpy as np
+import matplotlib.pyplot as plt
+
+
+def input_main_menu():
+    print('') 
+    print('What would you like to do?')
+    print('Type 1, 2, or 3 followed by enter:')
+    print('1. Compute and display BMI from weight and height.')
+    print('2. Compute and display a normal BMI range from height.')
+    print('3. Quit')
+    i = 0
+    while i==0:
+        s = input('Choice: ')
+        try:
+            i = int(s)
+        except:
+            pass
+        if not i in [1,2,3]:
+            print('You typed ' + s)
+            print('You should type 1, 2 or 3 followed by enter.')
+            i = 0
+    return(i)
+
+
+def input_measure(measure_type, units, m_min, m_max):
+    print('') 
+    m = 0
+    while m==0:
+        s = input('Type ' + measure_type + ' followed by enter: ') 
+        try:
+            m = float(s)
+        except:
+            pass
+        if m<m_min or m>m_max:
+            print('You typed ' + s)
+            print('Type a valid ' + measure_type + ' in ' + units +'.')
+            m = 0
+    return(m)
+
+
+def make_plot(height, weight=None):
+    h = np.linspace(1.3, 2.2)
+    plt.plot(h, 30*h**2, 'r')
+    plt.plot(h, 25*h**2, 'm')
+    plt.plot(h, 18.5*h**2, 'g')
+    if weight is None:
+        wmin = 18.5*height**2
+        wmax = 25*height**2
+        plt.plot([height, height], [wmin, wmax], 'k')
+        d = f'Normal range [{wmin:.2f} {wmax:.2f}]'
+    else:
+        plt.plot(height, weight, 'ko')
+        d = f'BMI {weight/(height**2):.2f}'
+    plt.legend(['Obese to overweight', 'Overweight to normal',
+                'Normal to underweight', d])
+    plt.xlabel('Height')
+    plt.ylabel('Weight')
+    plt.title('BMI plot')
+    plt.show()
+    
+
+# main program
+print('*************************')
+print('Welcome to BMI calculator')
+choice = 0
+while choice<3:
+    choice = input_main_menu()
+    if choice==1:
+        h = input_measure('height', 'meters', 1, 2.5)
+        w = input_measure('weight', 'kilograms', 40, 300)
+        make_plot(h, w)
+    elif choice==2:
+        h = input_measure('height', 'meters', 1, 2.5)
+        make_plot(h)        
+print('Bye!')
+    
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