解析issueDate提取年份和月份

def solve():
    from pyodide.http import open_url
    from io import StringIO
    loans_raw_csv = open_url("https://data.zuihe.com/dbd/riskctrl/state_02/loans_raw.csv").read()
    loans_clean_csv = open_url("https://data.zuihe.com/dbd/riskctrl/state_02/loans_clean.csv").read()
    import pandas as pd
    from io import StringIO
    df = pd.read_csv(StringIO(loans_raw_csv))
    df['issue_dt'] = pd.to_datetime(df['issueDate'],errors='coerce')
    df['issue_year'] = df['issue_dt'].dt.year
    df['issue_month'] = df['issue_dt'].dt.month
    print("issue_year分布(前5):")
    print(df['issue_year'].value_counts().head(5).to_string())
    print("issue_month分布(前5):")
    print(df['issue_month'].value_counts().sort_index().head(5).to_string())