我有10个CSV文件,每个CSV文件都具有相同的列数,以熊猫数据框的形式从中逐一读取数据。我希望这些数据以某种表格形式显示在控制台/终端上。而且应该就像每次数据进入新行一样。有什么建议吗?
像这样,有10个或更多CSV文件,我将一一读取这些文件中的数据,并希望显示在控制台/终端上。
我的应用程序简介
我有一台在一定时间间隔后将CSV文件生成到文件夹中的机器。我正在使用Watchdog库将手表放在正在生成CSV文件的文件夹中。当我收到CSV文件时,将其读入熊猫数据框。上面提供了示例CSV文件。
只要机器正在运行,它就会继续生成CSV文件。因此,如果我想查看需要打开每个CSV文件的数据,则需要一个视图,其中在生成新的CSV文件时更新数据。
因此从技术上讲,正在读取的一个CSV文件被转换为数据框,然后在控制台/终端上打印。并且,当生成新的CSV文件时,该过程再次发生。但是,当新的数据帧到达时,它不应覆盖整个控制台,而是附加到控制台上的现有数据。
这是我的主文件:
import time
from watchdog.observers import Observer
from watchdog.events import PatternMatchingEventHandler
import pandas as pd
from Append_Function import append_df_to_excel
import os.path
import sys
class Watcher:
def __init__(self, args):
self.watch_dir = os.getcwd()
print(args[0])
self.directory_to_watch = os.path.join(self.watch_dir, args[1])
self.observer = Observer()
self.event_handler = Handler(patterns=["*.CSV"], ignore_patterns=["*.tmp"], ignore_directories=True)
def run(self):
self.observer.schedule(self.event_handler, self.directory_to_watch, recursive=False)
self.observer.start()
try:
while True:
time.sleep(1)
except:
self.observer.stop()
print("Error")
self.observer.join()
class Handler(PatternMatchingEventHandler):
@staticmethod
def on_any_event(event):
if event.is_directory:
return None
elif event.event_type == 'created':
# Take any action here when a file is first created.
print("Received created event - %s." % event.src_path)
df = pd.read_csv(event.src_path, header=1, index_col=0)
append_df_to_excel(os.path.join(os.getcwd(), "myfile.xlsx"), df)
elif event.event_type == 'modified':
# Taken any actionc here when a file is modified.
df = pd.read_csv(event.src_path, header=0, index_col=0)
append_df_to_excel(os.path.join(os.getcwd(), "myfile.xlsx"), df)
print("Received modified event - %s." % event.src_path)
if __name__ == '__main__':
print(sys.argv)
w = Watcher(sys.argv)
w.run()
这是我的附加功能:
import pandas as pd
import openpyxl as ox
def append_df_to_excel(filename, df, sheet_name='Sheet1', startrow=None,
truncate_sheet=False,
**to_excel_kwargs):
# ignore [engine] parameter if it was passed
if 'engine' in to_excel_kwargs:
to_excel_kwargs.pop('engine')
writer = pd.ExcelWriter(filename, engine='openpyxl')
# Python 2.x: define [FileNotFoundError] exception if it doesn't exist
try:
FileNotFoundError
except NameError:
FileNotFoundError = IOError
try:
# try to open an existing workbook
writer.book = ox.load_workbook(filename,keep_vba=True)
# get the last row in the existing Excel sheet
# if it was not specified explicitly
if startrow is None and sheet_name in writer.book.sheetnames:
startrow = writer.book[sheet_name].max_row
# truncate sheet
if truncate_sheet and sheet_name in writer.book.sheetnames:
# index of [sheet_name] sheet
idx = writer.book.sheetnames.index(sheet_name)
# remove [sheet_name]
writer.book.remove(writer.book.worksheets[idx])
# create an empty sheet [sheet_name] using old index
writer.book.create_sheet(sheet_name, idx)
# copy existing sheets
writer.sheets = {ws.title: ws for ws in writer.book.worksheets}
except FileNotFoundError:
# file does not exist yet, we will create it
pass
if startrow is None:
startrow = 0
# write out the new sheet
df.to_excel(writer, sheet_name, startrow=startrow, **to_excel_kwargs, header=True)
# save the workbook
writer.save()