osiddiquee PR

Student/osiddiquee/lesson01/generator_solution.py

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+def intsum():
+    previous, last = 0, 0
+    while last >= 0:
+        if last == 0:
+            yield previous
+            last += 1
+        else:
+            sum = previous + last
+            previous = sum
+            last += 1
+            yield sum
+
+
+def doubler():
+    doubled = 1
+    while doubled > 0:
+        if doubled == 1:
+            yield 1
+            doubled *= 2
+        elif doubled == 2:
+            yield doubled
+            doubled *= 2
+        else:
+            yield doubled
+            doubled *= 2
+
+
+def fib():
+    first, second = 0, 1
+    while first >= 0:
+        if first == 0:
+            yield second
+            first = second
+            second *= 2
+        elif first == 1:
+            yield first
+            fib2 = second
+            second = first + fib2
+            first = fib2
+        else:
+            yield first
+            fib2 = second
+            second = first + fib2
+            first = fib2
+
+
+def prime():
+    integer = 2
+    while integer > 1:
+        if integer == 2:
+            yield integer
+        else:
+            isprime = True
+            for i in range(2, integer):
+                if integer % i == 0:
+                    isprime = False
+            if isprime:
+                yield integer
+        integer += 1

Student/osiddiquee/lesson01/iterator_2.py

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+#!/usr/bin/env python
+
+"""
+Simple iterator examples
+"""
+
+
+class IterateMe_2:
+    """
+    About as simple an iterator as you can get:
+
+    returns the sequence of numbers from zero to 4
+    ( like range(4) )
+    """
+
+    def __init__(self, start = 0, stop = 5, step = 1):
+        self.current = start
+        self.stop = stop
+        self.step = step
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        self.current += self.step
+        if self.current < self.stop:
+            return self.current
+        else:
+            raise StopIteration
+
+
+if __name__ == "__main__":
+
+    print("Testing the iterator")
+    for i in IterateMe_2():
+        print(i)

Student/osiddiquee/lesson01/music.py

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+import pandas as pd
+
+music = pd.read_csv('featuresdf.csv')
+
+artists = [artists for artists in
+           music[(music['danceability'] > 0.8) &
+                 (music['loudness'] < -5.0)].artists]
+
+songs = [name for name in
+         music[(music['danceability'] > 0.8) &
+               (music['loudness'] < -5.0)].name]
+
+danceability = [danceability for danceability in
+                music[(music['danceability'] > 0.8) &
+                      (music['loudness'] < -5.0)].danceability]
+
+spotify_data = list(zip(artists, songs, danceability))
+
+sorted_spotify = sorted(spotify_data, key = lambda x: x[2], reverse = True)
+
+print('Simple solution output: ')
+for artist, song, dance in sorted_spotify[:5]:
+    print(song)
+
+print('\nA much more elegant solution output: ')
+''' A much more elegant solution is below '''
+spotify_query = [(artist, song, dance, loud)
+             for (artist, song, dance, loud) in
+             zip(music.artists, music.name, music.danceability, music.loudness)
+             if (dance > 0.8) & (loud < -5.0)]
+
+for artist, song, dance, loud in sorted(spotify_query,
+                                        key = lambda x: x[2],
+                                        reverse = True)[:5]:
+    print(song)