Add REPL examples

Author: lpozo

python-string-formatting/f-strings.py

@@ -0,0 +1,15 @@
+name = "Bob"
+print(f"Hello, {name}!")
+
+print(f"The number is {42}")
+a = 5
+b = 10
+print(f"{a} plus {b} is {a + b}")
+
+debit = 300.00
+credit = 450.00
+print(f"Debit: ${debit}, Credit: ${credit}, Balance: ${credit - debit}")
+print(
+    f"Debit: ${debit:.2f}, Credit: ${credit:.2f}, "
+    f"Balance: ${credit - debit:.2f}"
+)

python-string-formatting/format-method.py

@@ -0,0 +1,12 @@
+number_template = "The number is {}"
+print(number_template.format(42))
+
+a = 5
+b = 10
+sum_template = "{0} plus {1} is {2}"
+print(sum_template.format(a, b, a + b))
+
+debit = 300.00
+credit = 450.00
+template = "Debit: ${0:.2f}, Credit: ${1:.2f}, Balance: ${2:.2f}"
+print(template.format(debit, credit, credit - debit))

python-string-formatting/modulo-operator.py

@@ -0,0 +1,35 @@
+print("%d" % 123.123)  # As an integer
+print("%o" % 42)  # As an octal
+print("%x" % 42)  # As a hex
+print("%e" % 1234567890)  # In scientific notation
+print("%f" % 42)  # As a floating-point number
+
+
+# Named replacement fields
+jane = {"first_name": "Jane", "last_name": "Doe"}
+print("Full name: %(first_name)s %(last_name)s" % jane)
+# Minimal width of 15 chars
+print("%-15f" % 3.1416)  # Aligned to the left
+print("%15f" % 3.1416)  # Aligned to the right
+# Dynamic width
+width = 15
+print("%-*f" % (width, 3.1416))
+print("%*f" % (width, 3.1416))
+# Precision
+print("%.2f" % 3.141592653589793)
+print("%.4f" % 3.141592653589793)
+print("%.8f" % 3.141592653589793)
+
+
+print("%o" % 10)
+print("%#o" % 10)
+print("%x" % 31)
+print("%#x" % 31)
+
+print("%05d" % 42)
+print("%10d" % 42)
+print("%-10d" % 42)
+print("% d" % 42)
+print("% d" % -42)
+print("%+d" % 42)
+print("%+d" % -42)