回答此问题可获得 20 贡献值，回答如果被采纳可获得 50 分。
<pre><code>lloyd = {
"name": "Lloyd",
"homework": [90.0, 97.0, 75.0, 92.0],
"quizzes": [88.0, 40.0, 94.0],
"tests": [75.0, 90.0]
}
alice = {
"name": "Alice",
"homework": [100.0, 92.0, 98.0, 100.0],
"quizzes": [82.0, 83.0, 91.0],
"tests": [89.0, 97.0]
}
tyler = {
"name": "Tyler",
"homework": [0.0, 87.0, 75.0, 22.0],
"quizzes": [0.0, 75.0, 78.0],
"tests": [100.0, 100.0]
}
students = ['lloyd', 'alice', 'tyler']
for student in students:
print student['name']
</code></pre>
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<p>提醒的错误是str的符号只能是整数，不能是str。请帮我找出我的错误</p>
