Why there is no do while loop in python

There is no do…while loop because there is no nice way to define one that fits in the statement: indented block pattern used by every other Python compound statement. As such proposals to add such syntax have never reached agreement. Nor is there really any need to have such a construct, not when you can just do: and have the exact … Read more

How to format strings in Java

In addition to String.format, also take a look java.text.MessageFormat. The format less terse and a bit closer to the C# example you’ve provided and you can use it for parsing as well. For example: A nicer example takes advantage of the varargs and autoboxing improvements in Java 1.5 and turns the above into a one-liner: MessageFormat is … Read more

Using or ‘|’ in regex [duplicate]

It’s because you are trying to match against the entire string instead of the part to find. For example, this code will find that only a part of the string is conforming to the present regex: When you want to match an entire string and check if that string contains he|be|de use this regex .*(he|be|de).* . means … Read more

Istio Ingress resulting in “no healthy upstream”

Although this is a somewhat general error resulting from a routing issue within an improper Istio setup, I will provide a general solution/piece of advice to anyone coming across the same issue. In my case the issue was due to incorrect route rule configuration, the Kubernetes native services were functioning however the Istio routing rules … Read more

Using “with open() as file” method, how to write more than once? [duplicate]

The w flag means “open for writing and truncate the file”; you’d probably want to open the file with the a flag which means “open the file for appending”. Also, it seems that you’re using Python 2. You shouldn’t be using the b flag, except in case when you’re writing binary as opposed to plain text content. In Python 3 your … Read more

How to use execvp() to execute a command

The prototype of execvp is It expects a pointer to char as the first argument, and a NULL-terminated pointer to an array of char*. You are passing completely wrong arguments. You are passing a single char as first argument and a char* as the second. Use execlp instead: So Also the convention in UNIX is to print error messages to stderr and a process with an error should have … Read more

error: src refspec master does not match any

From git branch it appears that somehow your local branch name is “origin”. You can rename the branch with -mv flag, like this: git branch -mv origin master After this git branch should show master 🙂 Just to make sure the name is indeed the only thing that went astray, you can run git log and look at the last few commits – and compare … Read more

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