irsol
diff --git a/‎boolean_practice/repetition.py
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+54Lines changed: 54 additions & 0 deletions b/‎boolean_practice/repetition.py
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+54Lines changed: 54 additions & 0 deletions
@@ -1 +1,55 @@
+# Double all values in a list using built-in range function.
+
+values = [1, 2, 3]
+for i in range(len(values)):
+    values[i] = 2 * values[i]
+
+print(values)
+
+
+# Double all values using enumerate built-in function.
+
+values = [1, 2, 3]
+for pair in enumerate(values):
+    i = pair[0]
+    v = pair[1]
+    values[i] = 2 * v
+
+print(values)
+
+
+# Easier to read solution
+
+values = [1, 2, 3]
+for (i, v) in enumerate(values):  # i stands for index in the list values, v stands for value in the list values
+    values[i] = 2 * v
+
+print(values)
+
+# Example of ragged list
+
+times = [["8:30", "9:03", "10:20", "11:23", "13:00"],
+         ["8:01", "9:35", "10:00", "11:01", "11:02"],
+         ["9:15", "10:01", "11:11", "11:29", "13:00"],
+         ["10:20", "11:00", "11:02", "11:07", "12:07"],
+         ["9:01", "12:23", "13:23", "14:00", "14:01"]]
+for day in times:
+    for time in day:
+        print(time)
+
+
+# Calculate the growth of a bacteria colony using a simple exponential growth model
+# P(t + 1) = P(t) + rP(t)
+# P(t) population size at time, r is the growth rate
+
+time = 0
+population = 1000
+growth_rate = 0.21 # 21% growth per minute
+while population < 2000:
+    population = round(population + growth_rate * population, 2)
+    print(population)
+    time = time + 1
+print(f"It took {time} minutes for the bacteria to double")
+print(f" and the final population was {population} bacteria")
+