CBOW-READ FILE

下列程式示範如何透過網址下載檔案

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function

import collections
import math
import os
import random
import zipfile

import numpy as np
from six.moves import urllib
from six.moves import xrange  # pylint: disable=redefined-builtin
import tensorflow as tf

# Step 1: Download the data.

1.    url = 'http://mattmahoney.net/dc/'

      #檔案名稱,檔案大小
2.    def maybe_download(filename, expected_bytes):
      """Download a file if not present, and make sure it's the right size."""
3.    if not os.path.exists(filename):
4.        filename, _ = urllib.request.urlretrieve(url + filename, filename)
5.    statinfo = os.stat(filename)
6.    if statinfo.st_size == expected_bytes:
7.        print('Found and verified', filename)
8.    else:
9.        print(statinfo.st_size)
10.        raise Exception('Failed to verify ' + filename + '. Can you get to it with a browser?')
11.    return filename


12.    filename = maybe_download('text8.zip', 31344016)


        # Read the data into a list of strings.
13.    def read_data(filename):
        """Extract the first file enclosed in a zip file as a list of words"""
14.    with zipfile.ZipFile(filename) as f:
15.        data = tf.compat.as_str(f.read(f.namelist()[0])).split()
16.    return data


17.    words = read_data(filename)
18.    print('Data size', len(words))

執行結果得到檔案名稱text8.zip和檔案大小:17005207

Found and verified text8.zip
Data size 17005207

如上圖所示讀取檔案時:會依據檔案型式，檔案來源和檔案路徑來撰寫相對應的方程式。本程式示範在網路上讀取ZIP檔

import Os模塊是Python基礎模塊之一，其提供了很多與作業系統交互的api。例如，獲取作業系統的變量：

import urllib可以存取網頁、下載資料、剖析資料、修改表頭(header)、執行GET與POST的請求

第10行: raise可以拋出異常，表示檔案有誤。其用法如下:

例子：如果輸入的數據不是整數，則引發一個ValueError

 inputValue=input\("please input a int data :"\)


 if type\(inputValue\)!=type\(1\):

     raise ValueError

 else:

     print inputValue

Python可用下列方式讀檔，一次讀取一行資料直到檔案結尾

with open(filename.txt,'r') as fp:
     all_lines = fp.readlines()

第17行監看words得執行結果

[1]檔案路徑:https://www.itread01.com/content/1503829342.html

[2]colab讀取.csv檔方式:https://ithelp.ithome.com.tw/questions/10189177

[3]python 讀取檔案的4個方法: https://www.phpini.com/perl/4-ways-write-file-line-by-line-in-python