How to use 'flask flash' in Python

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47def add_error(self,msg):
48 return self.flash(msg,self.ERROR_CLASS)
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913def flash_success_errors(error, action, redirect_url):
914 if error:
915 for each_error in error:
916 flash(gettext("%(msg)s",
917 msg='{action}: {err}'.format(
918 action=action, err=each_error)),
919 "error")
920 return redirect(redirect_url)
921 else:
922 flash(gettext("%(msg)s", msg=action),
923 "success")

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