How to read input from stdin in Python
This tutorial discussed stdinthe methods of reading input from in Python. You can read directly from the console or from a file name specified in the console.
In Python, fileinput.input()usestdin
fileinputWe can use the read module
in Python stdin. fileinput.input()It reads all the lines of the input file name specified in the command line argument. If no argument is specified, it reads the standard input provided.
The following example shows how to read from a specified input file name.
We will use the following sample.txt.
Hello
Line1
Line2
Below is the script read.py.
import fileinput
for line in fileinput.input():
print(line.rstrip())
We execute it like this.
python read.py "sample.txt"
Output:
Hello
Line1
Line2
The following example illustrates reading data from standard input.
import fileinput
for line in fileinput.input():
print("Output:", line.rstrip())
The execution and output are shown below.
python read.py
Line 1
Output: Line 1
Line 2
Output: Line2
^Z
We can save the data for later processing as follows:
import fileinput
data = []
for line in fileinput.input():
data.append(line.rstrip())
Note that we used line.rstrip(). to delete the trailing newline.
Entering ywill delete all variables.
In Python, sys.stdinusestdin
Another way is sys.stdinto read in Python using stdin. The following example illustrates stdinreading data line by line from .
import sys
for line in sys.stdin:
print("Output:", line.rstrip())
The execution and output are shown below.
python read.py
Line 1
Output: Line 1
Line 2
Output: Line2
^Z
We can also stdinread all the data from it at once, instead of reading it line by line.
The following example illustrates this.
import sys
data = sys.stdin.readlines()
data = [line.rstrip() for line in data]
Note that we used line.rstrip(). This is to remove the trailing newline character.
in conclusion
We discussed stdintwo ways to read input in Python, fileinput.input()and sys.stdin. fileinput.input()Data can be read from file names specified in command line arguments or from standard input, while sys.stdincan only read data from standard input.
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