LinuxInterview.md

Inspect

Memory
- cat /proc/meminfo, vmstat, top, htop
- free -m to display output in MB
- free -g to display output in GB
Port
- Parallel: (LPT) /dev/lp0, /dev/lp1, or /dev/lp2
- Serial: /dev/ttyS0 to /dev/ttyS7 (COM in windows)

PEP: Python Enhancement Proposal
Type conversion
- int() – converts any data type into integer type
- float() – converts any data type into float type
- ord() – converts characters into integer
- hex() – converts integers to hexadecimal
- oct() – converts integer to octal
- tuple() – This function is used to convert to a tuple.
- set() – This function returns the type after converting to set.
- list() – This function is used to convert any data type to a list type.
- dict() – This function is used to convert a tuple of order (key,value) into a dictionary.
- str() – Used to convert integer into a string.
- complex(real,imag) – This functionconverts real numbers to complex(real,imag) number.
Array Vs List: Arrays can hold only a single data type elements whereas lists can hold any data type elements.
Help() function: The help() function is used to display the documentation string and also facilitates you to see the help related to modules, keywords, attributes, etc.
Dir() function: The dir() function is used to display the defined symbols.
PUSH: append, extend and insert
POP: pop, remove
Encapsulation means binding the code and the data together
object(): returns a featureless object that is a base for all classes
How to get indices of N maximum values in a NumPy array?

import numpy as np
arr = np.array([1, 3, 2, 4, 5])
print(arr.argsort()[-3:][::-1])