Intro

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Making Decisions with if

~8 mincode completion

if runs a block of code only when a condition is true. elif ("else if") adds another condition, and else catches everything left over.

def water_state(temp_c):
    if temp_c <= 0:
        return "solid"
    elif temp_c < 100:
        return "liquid"
    else:
        return "gas"

Two things to internalise:

Conditions are checked in order, and the first true one wins. Everything after it is skipped.

return exits the function immediately. Nothing below a return that ran will execute.

The comparison operators are == (equal), != (not equal), <, <=, >, >=. Note that == compares, while a single = assigns. Using = in an if is a syntax error.

Your task:

Write letter_grade(score) that turns a score out of 100 into a letter:

| score | grade |

|---|---|

| 90 or above | "A" |

| 80 to 89 | "B" |

| 70 to 79 | "C" |

| below 70 | "F" |

The boundaries are inclusive at the bottom: 90 is an A, 89 is a B.

Example Tests

95 is comfortably an A

Input: {"score":95}

Expected: "A"

90 exactly is still an A, the boundary is inclusive

Input: {"score":90}

Expected: "A"

89 falls to a B

Input: {"score":89}

Expected: "B"

Python

def letter_grade(score):
    """
    Convert a numeric score to a letter grade.

    Args:
        score: a number from 0 to 100

    Returns:
        "A", "B", "C" or "F"
    """
    # YOUR CODE HERE
    pass

Run your code to see results

⌘↵ runs against the visible tests

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