datacursor_example_formatter_label.py

import random
import matplotlib.pyplot as plt
from mpldatacursor import datacursor

def main():
    accounts = generate_accounts()
    plot(accounts)
    datacursor(formatter='Account #\n{label}'.format, bbox=dict(alpha=1))
    plt.show()

def plot(accounts):
    fig, ax = plt.subplots()
    for i, account in enumerate(accounts):
        ax.bar([i], [account.balance], align='center', label=account.number)
    ax.set(xticks=range(len(accounts)), xticklabels=[x.owner for x in accounts],
           ylabel='Balance ($)')
    ax.grid(axis='y')

def generate_accounts():
    names = ['Mark', 'Nancy', 'Sam', 'John', 'Patricia', 'Anna']
    accounts = [random.randint(100000, 9999999) for _ in names]
    balances = [random.randint(-1000, 10000) for _ in names]
    return [BankAccount(*item) for item in zip(names, accounts, balances)]

class BankAccount:
    def __init__(self, owner, number, balance):
        self.owner, self.number, self.balance = owner, number, balance

main()