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统计支付方式分布与免费骑行比例

未完成
初级参考 完整示例代码供参考，建议自己理解后重新输入 
def solve():
    from pyodide.http import open_url
    from io import StringIO
    import pandas as pd
    payments=pd.read_csv(StringIO(open_url("https://data.zuihe.com/dbd/ms-bikeshare/state_01/payments.csv").read()))
    print(f"Total payments: {len(payments)}")
    print(f"By method: {dict(payments.groupby('payment_method').size())}")
    print(f"Total revenue: {round(payments['amount'].sum(),2)}")
    print(f"Avg amount: {round(payments['amount'].mean(),2)}")
    zero_fee=payments[payments['amount']==0]
    print(f"Free trips (amount=0): {len(zero_fee)}")

示例

输入
solve()
期望输出
Total payments: 300
By method: {'alipay': np.int64(104), 'wallet': np.int64(104), 'wechat': np.int64(92)}
Total revenue: 898.35
Avg amount: 2.99
Free trips (amount=0): 44
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