string formatting in python 3 code example

Example 1: python 3 text file leng

f = open("filename", "r") #Load file in any mode that's able to read, ie r, r+, w+ etc

#to get length
len(f.readlines())

#To iterate over each line
for line in f.readlines(): #file.readlines(), splits the file into a list, where each element is a seperate line
  print(line)

Example 2: f string in python

# f-strings are short for formatted string like the following
# you can use the formatted string by two diffrent ways
# 1
name = "John Smith"
print(f"Hello, {name}")		# output = Hello, John Smith

# 2
name = "John Smith"
print("Hello, {}".format(name))		# output = Hello, John Smith

Example 3: formatted string python

# Newer f-string format
name = "Foo"
age = 12
print(f"Hello, My name is {name} and I'm {age} years old.")
# output :
# Hello, my name is Foo and I'm 12 years old.

Example 4: python string format

string_a = "Hello"
string_b = "Cena"

# Index based:
print("{0}, John {1}"
      .format(string_a, string_b))
# Object based:
print("{greeting}, John {last_name}"
      .format(greeting=string_a, last_name=string_b))

Example 5: str.format python 3

print("Sammy the {pr} {1} a {0}.".format("shark", "made", pr = "pull request"))

Example 6: python format strings

name = "Rick"
age = 42
print(f"My name is {name} and I am {age} years old")