[英]how to use sys.stdin.read() in python
我正在嘗試使用peewee模塊將多個文本用戶輸入到db中,但是當我在控制台中按ctrl + d時,它給了我EOFError。我認為問題出在sys.stdin.read()上。 ? 這是代碼:
#!/user/bin/env python3
from peewee import *
import sys
import datetime
from collections import OrderedDict
db = SqliteDatabase('diary.db')
class Entry(Model):
content = TextField()
timestamp = DateTimeField(default=datetime.datetime.now) # no ()
class Meta:
database = db
def intitalize():
'''create database and table if not exists'''
db.connect()
db.create_tables([Entry], safe=True)
def menu_loop():
'''show menu'''
choice = None
while choice != 'q':
print("enter 'q' to quit")
for key, value in menu.items():
print('{}) {}'.format(key, value.__doc__))
choice = input('action: ').lower().strip()
if choice in menu:
menu[choice]()
def add_entry():
'''add an entry'''
print("Enter your entry. press ctrl+d when finished")
data = sys.stdin.read().strip()
if data:
if input('Save Entry?[Yn]').lower()!='n':
Entry.create(content=data)
print('saved successfully')
def view_entry():
'''view entries'''
def delete_entry():
'''delete an entry'''
menu = OrderedDict([
('a', add_entry),
('v', view_entry),
])
if __name__ == '__main__':
intitalize()
menu_loop()
這是我在pycharm中遇到的錯誤:
enter 'q' to quit
a) add an entry
v) view entries
action: a
Enter your entry. press ctrl+d when finished
some text
and more
^D
Save Entry?[Yn]Traceback (most recent call last):
File "C:/Users/Xylose/Desktop/small lab/peewee/venv/dairy.py", line 61, in <module>
menu_loop()
File "C:/Users/Xylose/Desktop/small lab/peewee/venv/dairy.py", line 34, in menu_loop
menu[choice]()
File "C:/Users/Xylose/Desktop/small lab/peewee/venv/dairy.py", line 42, in add_entry
if input('Save Entry?[Yn]').lower()!='n':
EOFError: EOF when reading a line
Process finished with exit code 1
在Python中
EOFError: EOF when reading a line
此錯誤有2個原因
1.以錯誤的方式/格式讀取文件
import sys
for line in sys.stdin:
print (line)
這就是我們如何使用“ sys.stdln”進行閱讀的方法
2.如果文件損壞,則有另一個機會發生相同的錯誤
通常允許在Ctrl-D之后從stdin讀取,但是我僅在Ubuntu上進行了測試(與您的代碼相似的代碼運行良好)。 我看到它正在Windows上運行,並且Windows控制台的行為可能有所不同,並在Ctrl-D之后拒絕任何read()操作。 一種可能的解決方案是使用try / except語句捕獲EOFError
異常,並在異常發生時關閉並重新打開sys.stdin。 像這樣:
# note: check that sys.stdin.isatty() is True!
try:
# read/input here
except EOFError:
sys.stdin.close()
sys.stdin = open("con","r")
continue # or whatever you need to do to repeat the input cycle
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