Python Basics
Aus MattWiki
This article contains my notes on the Python programming language as of Python 3.x.
Operators
See Python Operators
Built-in Functions
https://docs.python.org/3/library/functions.html
Strings
Convert a List of Strings to a String
list1 = ['Hello', 'World']
print(' '.join(list1))
# Output:
# Hello World
When used with a list of elements, which are not of type string, the elements need to be converted to string first.
Template Strings
a = "Munich"
b = "Frankfurt"
c = "Berlin"
# Template string
template = "We are doing a road trip from {} through {} to {}"
print(template.format(a, b, c))
# equivalent to:
print("We are doing a road trip from {} through {} to {}".format(a, b, c))
# equivalent to:
print("We are doing a road trip from {place1} through {place2} to {place3}".format(place3=c, place2=b, place1=a))
F-Strings
a = "Munich"
b = "Frankfurt"
c = "Berlin"
# f-String
print(f"We are doing a road trip from {a} through {b} to {c}")
Further reading:
- https://realpython.com/python-string-formatting/
- https://docs.python.org/3/whatsnew/3.12.html#pep-701-syntactic-formalization-of-f-strings
- https://docs.python.org/3/library/string.html#template-strings
Format Specification
Format Number to string with one decimal place and a % as suffix. Not needed decimal places rounded as follows:
print("{:.1f}%".format(2.25)) #output: 2.2%
print("{:.1f}%".format(2.26)) #output: 2.3%
See https://docs.python.org/3/library/string.html#formatspec
Classes and Object Methods
https://docs.python.org/3/reference/datamodel.html#emulating-container-types
Command Line
https://docs.python.org/3/using/cmdline.html
Executing functions from command line
A function called myfunction from myscript.py can be executed directly from the command line like this:
python -c 'import myscript; myscript.myfunction(var1, var2)
