I am writing a go program that sends data to another program via stdin and reads the response via stdout. Here is a script which acts as an "echo server" of sorts: import sys if __name__==’__main__’: for line in sys.stdin: print("Hello", line.strip()) When I try to communicate with this program in Go, it hangs on… Read More Cannot read from Pipe using exec.Command in Go

While using the pipe the lhs is automatically placed as the first argument of the rhs. This leads to the fact that both codes are equal: library(dplyr) 1:10 %>% mean(na.rm = TRUE) # same as… 1:10 %>% mean(., na.rm = TRUE) I just come into a situation where I needed the pipe to stop automatically… Read More Setting the pipe so that it does not put . automatically as first argument

I’m following the free book Operating Systems: Three Easy Pieces by Arpaci-Dusseau, and despite being very new to C programming (constructive criticism is welcomed), I tried my luck on coding problem 8 from chapter 5: Write a program that creates two children, and connects the standard output of one to the standard input of the… Read More Loop doesn't finish when reading from pipe

I have one anonymous pipe and two child processes. I write one number in the pipe and now i have to read it in both processes. is there any way? I tried to GetStdHandle(STD_INPUT_HANDLE), also I tried to use cin.peek but it doesn’t work for me. >Solution : You don’t tell us which kind of… Read More is there any way to read one number from the anonymous pipe in two different processes?

Pandas pipe throws error that df to be passed as argument Ideally pipe should take the dataframe as argument by default which is not happening in my case. class Summary: def get_src_base_df(self): <do stuff> return df @staticmethod def sum_agg(df): cols = ‘FREQUENCY_ID|^FLAG_’ df = (df.filter(regex=cols).fillna(0) .groupby(‘FREQUENCY_ID’).agg(lambda x: x.astype(int).sum())) return df # few other @static methods… Read More Pandas pipe throws error that df to be passed as an argument

Here i try to implement linux shell script with piping in c, and i try to do it by passing the output of 1st child process to the 2nd child, and then do "grep a", then it should return sth like this a 1 a 4 ,and it should end the program. But what i… Read More Problem on piping with shell command in C

How do i keep a variable value after a while loop? My intention here is to put a if clause within the while to count each time an operation has been done, but isn’t working since the count resets after each while loop. count=0 for file in $(ls /path) do cat $ file | while… Read More How to keep a variable after a while loop bash

Hi friends I want to write a data in a writer and pass it to a library using a reader so that it can read Now the problem I have is that of png. Encode no longer continues and gets stuck there r, w := io.Pipe() err := png.Encode(w, img) Tell me the solution if… Read More Difficulty in using io.Pipe

I want to run a for loop with all columns starting from 1. Below is my code import pandas as pd dat = pd.DataFrame({‘X’ : [‘X’, ‘Y’], ‘A’ : [1,2], ‘B’ : [3,4]}) for i in range(1, 3) : dat.iloc[:, i] = dat.iloc[:, i].astype(float) While this is fine, I want to use pipe method to… Read More Running loop on all columns with pipe