csv中第一个数字的数字频率，不导入

import csv

def calculate_frequency(csv_file):
    frequency = {}
    
    with open(csv_file, 'r') as file:
        reader = csv.reader(file)
        for row in reader:
            if row:  # 跳过空行
                first_number = extract_first_number(row[0])
                if first_number is not None:
                    if first_number in frequency:
                        frequency[first_number] += 1
                    else:
                        frequency[first_number] = 1
    
    return frequency

def extract_first_number(string):
    # 提取字符串中的第一个数字
    for char in string:
        if char.isdigit():
            return int(char)
    
    return None

# 示例用法
csv_file = 'data.csv'
frequency = calculate_frequency(csv_file)

for number, count in frequency.items():
    print(f"数字 {number} 出现的频率为 {count} 次")