Read Bash variables into a Python script

Read Bash variables into a Python script

You can read environment variables from a Bash script into a Python script by using the os module in Python. Environment variables set in a Bash script are accessible to any child processes, including Python scripts.

Here's how you can read a Bash environment variable into a Python script:

  • Set the environment variable in your Bash script:
#!/bin/bash # Set an environment variable export MY_VARIABLE="Hello from Bash!"
  • In your Python script, you can access this environment variable using the os module:
import os # Read the environment variable my_variable = os.environ.get("MY_VARIABLE") # Check if the environment variable exists if my_variable is not None: print(f"Environment variable MY_VARIABLE: {my_variable}") else: print("Environment variable MY_VARIABLE is not set.")

In this example, we use os.environ.get("MY_VARIABLE") to read the value of the MY_VARIABLE environment variable set in the Bash script. If the environment variable is not set, the get() method returns None.

Make sure to replace "MY_VARIABLE" with the actual name of the environment variable you want to read. This approach allows you to pass data and configuration information from a Bash script to a Python script using environment variables.

Examples

  1. How to read Bash environment variables into a Python script?

    • Use the os module in Python to access Bash environment variables.
    # Set an environment variable in Bash export MY_VAR="Hello from Bash" 
    import os my_var = os.getenv("MY_VAR") # Read the environment variable print(my_var) # Output: Hello from Bash

  2. How to pass Bash variables to a Python script via command-line arguments?

    • Use command-line arguments to pass Bash variables to a Python script.
    # Set a Bash variable MY_VAR="Hello from Bash" # Pass it to a Python script as a command-line argument python3 my_script.py "$MY_VAR" 
    import sys bash_var = sys.argv[1] # Read the first command-line argument print(bash_var) # Output: Hello from Bash

  3. How to source Bash variables in a Python script?

    • Use subprocesses to source Bash variables and capture their values in Python.
    # Define some Bash variables export VAR1="Value1" export VAR2="Value2" 
    import subprocess # Source the variables and capture the output result = subprocess.run( ['bash', '-c', 'echo $VAR1 $VAR2'], capture_output=True, text=True ) output = result.stdout.strip() # Get the output var1, var2 = output.split() # Split into individual variables print(var1, var2) # Output: Value1 Value2

  4. How to use Bash source command to read environment variables in Python?

    • Use subprocess.run to source a Bash script and capture its variables in Python.
    # Bash script to source echo "export MY_ENV='Environment Variable'" > my_env.sh 
    import subprocess # Source the script and get the variable result = subprocess.run( ['bash', '-c', 'source my_env.sh && echo $MY_ENV'], capture_output=True, text=True ) my_env = result.stdout.strip() print(my_env) # Output: Environment Variable

  5. How to export Bash variables to a Python script using subprocesses?

    • Pass Bash variables to Python via subprocesses using subprocess.run.
    export MY_VAR="Subprocess Test" 
    import subprocess # Run a Python script from Bash and pass the variable result = subprocess.run( ['python3', '-c', 'import os; print(os.getenv("MY_VAR"))'], capture_output=True, text=True ) print(result.stdout.strip()) # Output: Subprocess Test

  6. How to read Bash environment variables into Python without subprocess?

    • Access Bash environment variables directly in Python.
    export MY_VARIABLE="Direct Environment Variable" 
    import os my_var = os.environ["MY_VARIABLE"] # Get the environment variable print(my_var) # Output: Direct Environment Variable

  7. How to pass multiple Bash variables to a Python script?

    • Pass multiple variables via command-line arguments to a Python script.
    VAR1="Value One" VAR2="Value Two" # Pass both variables to a Python script python3 my_script.py "$VAR1" "$VAR2" 
    import sys var1 = sys.argv[1] # Get the first argument var2 = sys.argv[2] # Get the second argument print(var1, var2) # Output: Value One Value Two

  8. How to read Bash variables into a Python script and manipulate them?

    • Access Bash variables and perform operations in Python.
    export NUM1=10 export NUM2=20 
    import os num1 = int(os.getenv("NUM1")) # Convert to integer num2 = int(os.getenv("NUM2")) result = num1 + num2 # Perform addition print(result) # Output: 30

  9. How to pass Bash variables to a Python script through a text file?

    • Write Bash variables to a text file, then read and process them in a Python script.
    echo "VAR_FROM_FILE=File-Based Variable" > vars.txt 
    with open("vars.txt", "r") as file: lines = file.readlines() var_dict = {line.split("=")[0]: line.split("=")[1].strip() for line in lines} print(var_dict["VAR_FROM_FILE"]) # Output: File-Based Variable

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