如何在python代码出现错误后自动重新启动它？

下面的方法不起作用。我有一个程序可以连接到一个网页，但有时由于一些问题，它无法连接，我希望程序在出错后完全重新启动。想象一下主函数调用程序，我如何编写这样的代码

import numpy as np

def main():
    np.load('File.csv')

for i in range(1, 10):
    try:
        main()
    except Exception as e:
        print e
        print 'Restarting!'
        main()

---

要在python内部执行此操作，请相应地使用

try/except

：

import numpy as np

def main():
    np.load('File.csv')

for i in range(1, 10):
    try:
        main()
    except Exception as e:
        print e
        print 'Restarting!'
        continue
    else:
        break

对于简单的指令，这是可行的，但如果代码变得更复杂，将整个

main（）

函数放入

try/except

块会隐藏异常，并使程序难以调试。因此，我建议在python之外处理重启，例如在bash脚本中

对于这种情况（连接到网页），通常最好根据时间设置上限，而不是根据尝试连接的次数。因此，请改用

while

循环：

import numpy as np
import time

def main():
    np.load('file.csv')

start = time.time()
stop = start + 5
attempts = 0
result = 'failed'

while True:
    if time.time()<stop:
        try:
            main()
        except Exception as e:
            attempts += 1
            print e
            time.sleep(0.1) # optional
            print 'Restarting!'
            continue
        else:
            result = 'succeeded'
    print 'Connection %s after %i attempts.' % (result, attempts)
    break

测试程序：

class RetryTest():
    def __init__(self, succeed_on = 0, excp = Exception()):
        self.succeed_on = succeed_on
        self.attempts = 0
        self.excp = excp
    def __call__(self):
        self.attempts += 1
        if self.succeed_on == self.attempts:
            self.attempts = 0
        else:
            raise self.excp

retry_test1 = RetryTest(3)
retry(retry_test1, 5, 0.1)
# succeeded after 3 attempts.
retry_test2 = RetryTest()
retry(retry_test2, 5, 0.1)
# failed after 50 attempts.

---

您可以在这里很好地使用递归函数来自动重新启动代码。使用setrecursionlimit（）定义尝试次数，如下所示：

import numpy as np
import sys
sys.setrecursionlimit(10)  # set recursion depth limit


def main():
    try:
        a = np.load('file.csv')
        if a:
            return a
    except Exception as e:
        return main()

result = main()
print result

---

希望这能有所帮助：）

@auryndb它之前实际上有点坏了；现在修好了。

class RetryTest():
    def __init__(self, succeed_on = 0, excp = Exception()):
        self.succeed_on = succeed_on
        self.attempts = 0
        self.excp = excp
    def __call__(self):
        self.attempts += 1
        if self.succeed_on == self.attempts:
            self.attempts = 0
        else:
            raise self.excp

retry_test1 = RetryTest(3)
retry(retry_test1, 5, 0.1)
# succeeded after 3 attempts.
retry_test2 = RetryTest()
retry(retry_test2, 5, 0.1)
# failed after 50 attempts.

import numpy as np
import sys
sys.setrecursionlimit(10)  # set recursion depth limit


def main():
    try:
        a = np.load('file.csv')
        if a:
            return a
    except Exception as e:
        return main()

result = main()
print result