泊松分布犯罪次数建模

def solve():
    import pandas as pd
    import numpy as np
    import matplotlib.pyplot as plt
    from scipy.stats import poisson
    url = '____'
    df = pd.read_csv(____)
    lam = round(df['____'].mean(), ____)
    print(____)
    k_vals = [____, ____, ____, ____]
    theory = [poisson.pmf(____) for k in k_vals]
    actual = [(____).mean() for k in k_vals]
    for k, th, ac in zip(____):
        print(____)
    x = np.arange(len(____))
    width = ____
    plt.bar(____)
    plt.bar(____)
    plt.xticks(____)
    plt.ylabel(____); plt.title(____); plt.legend()
    plt.tight_layout(); plt.show()