3. Syntax of a List

• An empty list

1 lista = [] Edit this code line that just executed next line to execute << First < Prev Next > Last >> Step 1 of 1 Submit Python Tutor by Philip Guo Customize visualization (NEW!)

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Activity: CodeLens 3.1 (cl_l17_3a_en)

• A list with three grades.

1 grades = [7.5, 9, 8.3] Edit this code line that just executed next line to execute << First < Prev Next > Last >> Step 1 of 1 Submit Python Tutor by Philip Guo Customize visualization (NEW!)

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Activity: CodeLens 3.2 (cl_l17_3b_en)

• Accessing a grade.

1 grades = [7.5, 9, 8.3] 2 print(grades[0]) Edit this code line that just executed next line to execute << First < Prev Next > Last >> Step 1 of 2 Submit Python Tutor by Philip Guo Customize visualization (NEW!)

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Activity: CodeLens 3.3 (cl_l17_3c_en)

• Changing the first grade.

1 grades = [7.5, 9, 8.3] 2 grades[0] = 8.7 3 print(grades[0]) Edit this code line that just executed next line to execute << First < Prev Next > Last >> Step 1 of 3 Submit Python Tutor by Philip Guo Customize visualization (NEW!)

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Activity: CodeLens 3.4 (cl_l17_3d_en)

• Average of 5 grades.

1 grades = [6, 7, 5, 8, 9] 2 sum = 0 3 x = 0 4 while x < 5: 5     sum += grades[x] 6     x += 1 7 print("Average: %5.2f" % (sum / x)) Edit this code line that just executed next line to execute << First < Prev Next > Last >> Step 1 of 20 Submit Python Tutor by Philip Guo Customize visualization (NEW!)

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Activity: CodeLens 3.5 (cl_l17_3e_en)

• Note: x += 1 is the same as x = x + 1.

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