python实现一个多线程读取excel的程序
时间: 2024-05-08 18:18:25 浏览: 267
好的,可以给您提供一个示例代码:
```python
import threading
import pandas as pd
class ExcelReaderThread(threading.Thread):
def __init__(self, file_path, sheet_name, start_row, end_row, result_queue):
super(ExcelReaderThread, self).__init__()
self.file_path = file_path
self.sheet_name = sheet_name
self.start_row = start_row
self.end_row = end_row
self.result_queue = result_queue
def run(self):
df = pd.read_excel(self.file_path, sheet_name=self.sheet_name, skiprows=range(1, self.start_row))
for i in range(self.start_row, self.end_row):
row_data = df.iloc[i]
self.result_queue.put(row_data)
def read_excel_multithread(file_path, sheet_name, num_threads):
df = pd.read_excel(file_path, sheet_name=sheet_name, nrows=1)
num_rows = df.shape[0]
result_queue = queue.Queue()
threads = []
for i in range(num_threads):
start_row = int(i * num_rows / num_threads)
end_row = int((i + 1) * num_rows / num_threads)
thread = ExcelReaderThread(file_path, sheet_name, start_row, end_row, result_queue)
threads.append(thread)
for thread in threads:
thread.start()
for thread in threads:
thread.join()
results = []
while not result_queue.empty():
results.append(result_queue.get())
return pd.DataFrame(results)
```
这是一个多线程读取Excel文件的程序,它将Excel文件分成若干个区间,然后每个区间使用一个线程来读取。在运行过程中,每个线程将读取到的数据放入一个队列中,最后再将队列中的数据合并成一个DataFrame返回。使用方法如下:
```python
df = read_excel_multithread('test.xlsx', 'Sheet1', 4)
```
其中,第一个参数是Excel文件的路径,第二个参数是将要读取的工作表名称,第三个参数是线程数。在本例中,文件将被分成4个区间,每个区间将使用一个线程来读取。
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