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
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
|
from pathlib import Path
path = Path('pi_digital.txt')
content = path.read_text().rstrip()
print(content)
content_split = content.splitlines()
pi_string = ''
for line in content_split:
pi_string += line
print(pi_string)
pi_string = ''
for line in content_split:
pi_string += line.lstrip()
print(pi_string)
def division_calculator(a,b):
try:
print(a/b)
except:
print('You are trying to divide by zero!')
r"""
Traceback (most recent call last):
File "c:\Users\onlym\Documents\code\python_works\fundemental\file_and_error\error.py", line 10, in <module>
division_calculator(5/0)
~^~
ZeroDivisionError: division by zero
"""
r'''
try:
division_calculator(5/0)
except:
print('You are trying to divide by zero!')
'''
division_calculator(5,0)
from pathlib import Path
path = Path('non_existent_file.txt')
try:
content = path.read_text(encoding='utf-8')
except FileNotFoundError:
print('The file does not exist!')
else:
words = content.split()
num_words = len(words)
print(f'The file {path} has about {num_words} words.')
def count_words(path):
try:
content = path.read_text(encoding = 'utf-8')
except:
print('Sorry, the file {path} does not exist.')
else:
words = content.split()
num_words = len(words)
print(f'The file {path} has about {num_words} words.')
from pathlib import Path
path = Path('test_write.txt')
path.write_text('Hello, World!\nThis is a test file.\nHave a great day!')
contents = 'I love programing.\n'
contents += 'I love sloving alogrithm problems!\n'
contents += 'I love learning!'
path_2 = Path('programing.txt')
path_2.write_text(contents)
from pathlib import Path
import json
def get_stored_username(path):
'''如果储存了用户名，就获取'''
if path.exists():
content = path.read_text()
username = json.loads(content)
return username
else:
return None
def greet_user():
'''问候用户'''
path = Path('username.json')
username = get_stored_username(path)
if username != None:
print(f"Welcome back {username}!")
else:
get_start_username()
def get_start_username():
'''获取新的用户名'''
path = Path('username.json')
username = input("Please input your username:")
content = json.dumps(username)
path.write_text(content)
print("We'll remember you next time!")
greet_user()
from pathlib import Path
import json
number = [10,9,8,7,6,5,4,3,2,1]
path = Path('number.json')
contents = json.dumps(number)
path.write_text(contents)
from pathlib import Path
import json
username = input("What's your name?")
path = Path('username.json')
contents = json.dumps(username)
path.write_text(contents)
print(f"We'll remember you when you come back, {username}")
from pathlib import Path
import json
path = Path('username.json')
content = path.read_text()
username = json.loads(content)
print(f'Welcome back, {username}!')
|