TillReg

AdvancedTutorials/2_ListComprehensions.py

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+# List Comprehensions is a very powerful tool, which creates a new list based on another list, in a single, readable line.
+# For example, let's say we need to create a list of integers which specify the length of each word in a certain sentence, but only if the word is not the word "the".
+
+sentence = "the quick brown fox jumps over the lazy dog"
+words = sentence.split()
+word_lengths = []
+for word in words:
+      if word != "the":
+          word_lengths.append(len(word))
+print(words)
+print(word_lengths)
+
+#Using a list comprehension, we could simplify this process to this notation
+sentence = "the quick brown fox jumps over the lazy dog"
+words = sentence.split()
+word_lengths = [len(word) for word in words if word != "the"]
+print(words)
+print(word_lengths)
+
+# Exercise
+# Using a list comprehension, create a new list called "newlist" out of the list "numbers", which contains only the positive numbers from the list, as integers.
+
+numbers = [34.6, -203.4, 44.9, 68.3, -12.2, 44.6, 12.7]
+newlist = [int(number) for number in numbers if number > 0]
+print(newlist)