[英]Fire Store's on_snapshot() function in Python executes twice. How to make it execute once?
[英]How to make try function in PYTHON execute only once while except executes many times?
如果“尝试”正确且不显示错误,如何让我的脚本只打印一次“数字”?
当它出错时,我希望它继续尝试并打印(“错误。尝试:”+ str(x))。 但如果一切顺利,我希望它只打印(数字)一次。
制作此脚本是为了跟踪在文件夹中创建某个 excel 电子表格的时间。 当它在文件夹中时,我希望脚本打印(数字)。
问题是当 excel 已经在文件夹中时,脚本会继续打印 (number) 16 次,直到 num_retries 完成。
num_retries = 16
interval = 2
for x in range(1, num_retries):
try:
result = open("I:/workbook.xls")
import xlrd
workbook = xlrd.open_workbook("I:/workbook.xls")
worksheet = workbook.sheet_by_name("sheet1")
number = worksheet.cell(3, 13).value
print(number)
except:
sleep(interval)
print("Error. Attempt: " + str(x))
pass
谢谢!
在您的print(number)
之后添加break
以便当它跳出循环时获得正确的数字。 你的代码是这样的:
for x in range(1, num_retries):
try:
result = open("I:/workbook.xls")
import xlrd
workbook = xlrd.open_workbook("I:/workbook.xls")
worksheet = workbook.sheet_by_name("sheet1")
number = worksheet.cell(3, 13).value
print(number)
break
except:
sleep(interval)
print("Error. Attempt: " + str(x))
pass
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