-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy path04_file.py
More file actions
102 lines (85 loc) · 3.04 KB
/
04_file.py
File metadata and controls
102 lines (85 loc) · 3.04 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
# 文件编码---UTF-8（世界通用编码）
# GBK---简体中文
# Big5---繁体中文
# 文件的操作
# 打开文件
# "w"---原有内容会被删除
# "a"---追加内容
# f = open("D:/云计算/input.txt", "r", encoding="UTF-8") # 使用斜杠
# 读写文件---f会移动
# read()---默认读取全部内容（返回字符串）
# f = open("D:/云计算/input.txt", "r", encoding="UTF-8") # 使用斜杠
# print(f"读取10个字节的结果为：{f.read(1)}")
# print(f"读取全部内容的结果为：\n{f.read()}") # 读取剩余全部内容
# readlines()---读取全部行封装到列表中
# f = open("D:/云计算/input.txt", "r", encoding="UTF-8") # 使用斜杠
# print(f"读取全部行进行封装后得到：{f.readlines()}")
# readline()
# f = open("D:/云计算/input.txt", "r", encoding="UTF-8") # 使用斜杠
# line1 = f.readline()
# line2 = f.readline()
# line3 = f.readline()
# print(f"第一行数据为：{line1}")
# print(f"第二行数据为：{line2}")
# print(f"第三行数据为：{line3}")
# for循环
# f = open("D:/云计算/input.txt", "r", encoding="UTF-8") # 使用斜杠
# for line in f:
# print(f"每一行内容：{line}")
# # .close()---关闭文件
# f.close()
# with open()方法自动close文件
# with open("D:/云计算/input.txt", "r", encoding="UTF-8") as f:
# print(f.readlines())
# print("===========================================")
# f = open("D:/word.txt", "r", encoding="UTF-8")
# 方法1
# count_apple = 0
# for line in f: # 这里遍历f即可
# # print(type(line))
# count_apple += line.count("apple")
# print(f"word.txt中出现了{count_apple}次苹果")
# f.close()
# 方法2
# content = f.read()
# count_apple = content.count("apple")
# print(f"word.txt中出现了{count_apple}次苹果")
# f.close()
# 方法3
# count_apple = 0
# for line in f:
# line = line.strip("\n")
# words = line.split(" ") # 1 返回列表 2 会有apple\n的情况
# # print(words)
# for word in words:
# if word == "apple":
# count_apple += 1
# print(f"word.txt中出现了{count_apple}次苹果")
# f.close()
# 写文件
# 内容刷新
# f.write() # 写入内存
# f.flush() # 刷新内容到硬盘中（攒一堆，一次性写入硬盘）
# f = open("D:/test.txt", "w", encoding="UTF-8") # 文件不存在创建新文件
# f.write("Hello World")
# # f.flush()
# f.close() # 内置.flush()
# f = open("D:/test.txt", "w", encoding="UTF-8") # 1 文件不存在创建新文件 2 清空内容写
# f.write("apple banana")
# f.close()
# 追加模式 "a"---需要.flush()（.close()内置）
# f = open("D:/test.txt", "a", encoding="UTF-8") # 文件不存在创建新文件
# f.write("Hello World!!!")
# f.write("\nThis is an apple.")
# f.close()
# print("================================")
# f_r = open("D:/bill.txt", "r", encoding="UTF-8")
# f_bak = open("D:/bill.txt.bak", "a", encoding="UTF-8")
# for line in f_r:
# if line.strip("\n").split(",")[-1] == "测试":
# continue
# # else:
# # f_bak.write(line)
# f_bak.write(line)
# f_r.close()
# f_bak.close()