A Technical I.T./DevOps Blog
Problem scenario
The security team for your enterprise will not permit Python 2 to be installed. (You do not want to install a new minimal Python package either.) How do you fix the problem of env: ‘python’: No such file or directory when you run a make command?
Solution
The command “python” (not python3), will work after you run this script.
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Problem scenario
You want to use the reserved word “next” to parse through an iterable. What do you do?
Solution
Run this six-line program as an illustration:
contint = [ 15, 50, -100, ‘foobar’]
var1=iter(contint)
print(next(var1))
print(next(var1))
print(next(var1))
print(next(var1)) …
Continue reading “How Do You Use the “next” Function to Iterate Through an Iterable in Python?”
Problem scenario
You are trying to have Python run Bash commands. As soon as the command includes a flag or a second argument, there is no value being assigned in Python. Two or more words in the Bash command cause no value to be assigned. What can you do?
Solution
This only works if you have complete control of the Bash command arguments.
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Continue reading “Using Python How Do You Run Bash Commands That Include More Than One Word?”
Problem scenario
You want to create multiple A records in DNS. But to do it manually using the MMC would take too long. What should you do?
Solution
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Continue reading “How Do You Add Multiple DNS A Records in Active Directory Using a File?”
Problem scenario
You are running a Python program or trying to execute a line from the Python interpreter command line. You receive this message: “SyntaxError: EOL while scanning string literal”. What should you do?
Solution
Look for the double quotes and single quotes. Have they all be terminated? Are they in an even number? Was the code copied to a different workstation application and then pasted into vi or a terminal prompt?
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Problem scenario
You want to list all the VPCs in your account. You are using Boto3 and Python 3. What do you do?
Solution
Run this four-line program:
import boto3
client boto3.client(‘ec2’)
response = client.describe_vpcs()
print(response)
Citation: The above was adapted from https://stackoverflow.com/questions/47329675/boto3-how-to-check-if-vpc-already-exists-before-creating-it
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Continue reading “How Do You Write a Python Program to Print All the VPCs in Your AWS Account?”
Problem scenario
You want to use a Python function decorator. What do you do?
Solution
Background: “A decorator in Python is a function that takes another function as its argument, and returns yet another function.” (According to this source.)
Procedures
Run this program:
def enhanced_multiply(paramfunc):
def contint(c,d):
print(“I am going to multiply”,c,”and”,d)
return paramfunc(c,d)
return contint # Here is where contint is elegantly & …
Continue reading “How Do You Use a Python Function Decorator?”
Problem scenario
You are running a Python program or running a command from the Python 3 interpreter. You get this error:
Traceback (most recent call last):
File “”, line 1, in
ModuleNotFoundError: No module named ‘flask’
What should you do to use Flask with Python 3?
Solution
Prerequisite
You need to have pip3 installed.
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Continue reading “How Do You Troubleshoot the Error “ModuleNotFoundError: No module named ‘flask’”?”
Problem scenario
You are trying to run a pip command. But you get “/bin/python3.7: bad interpreter: Permission denied”. What should you do about these “bad interpreter” errors in response to having run pip commands?
Solution
Use “sudo” before the pip command. It should allow you to run the pip command. You may need to be a different user or obtain sudoer rights.
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Problem scenario
You want to list the Route Tables in your AWS account (under VPC). You are using Python and Boto3. What should you do?
Solution
Run this program with Python 3:
import boto3
ec2 = boto3.client(‘ec2’)
rts = ec2.describe_route_tables()
print(rts) …
Continue reading “How Do You Use Python and Boto3 to List VPC Route Tables?”