#!/usr/bin/env python3.6

# String substitutions

### 1. The old way of substituion, % substitution.

print("Method 1 : Classic method of string substitution.")

# Example 1:

print("Hello there, I love %s" % ("python"))

# This prints "Hello there, I love python"

# Example 2:

author = "Homer"

book = "Illiad"

print("%s wrote %s\n" % (author, book))

# This prints "Homer wrote Illiad"

### 2. The second method of substitution, `.format()` method.

# Example 1:

print("Method 2 : New method of string substitution.")

print("Hello there, I love {0}".format("python"))

# Example 2:

author = "Homer"

book = "Illiad"

print("{0} wrote {1}\n".format(author, book))

### 3. The latest method of substitution, `f strings`, in Python 3.6 onwards.

print("Method 3 : `f` string method from Python 3.6 onwards.")

# Example 1:

x = "Python"

print(f"Hello there, I love {x}")

# Example 2:

author = "Homer"

book = "Illiad"

print(f"{author} wrote {book}")

# NOTE: The above `f` string format only work in Python 3.6 onwards.