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Merge pull request #572 from realpython/python-formatted-output
Sample code for the article on string formatting tools
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‎python-formatted-output/README.md‎

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# A Guide to Modern Python String Formatting Tools
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This folder provides the code examples for the Real Python tutorial [A Guide to Modern Python String Formatting Tools](https://realpython.com/python-formatted-output/).

‎python-formatted-output/format.py‎

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print(f"{257:b}")
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print("{:b}".format(257))
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print(f"{42:c}")
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print("{:c}".format(42))
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print(f"{3.14159:g}")
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print(f"{-123456789.8765:g}")
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print("{:g}".format(3.14159))
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print("{:g}".format(-123456789.8765))
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print(f"{-123456789.8765:G}")
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print("{:G}".format(-123456789.8765))
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infinite = float("inf")
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not_a_number = infinite * 0
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print(f"{infinite:g}")
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print(f"{not_a_number:g}")
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print(f"{infinite:G}")
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print(f"{not_a_number:G}")
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print("{:g}".format(infinite))
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print("{:g}".format(not_a_number))
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print("{:G}".format(infinite))
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print("{:G}".format(not_a_number))
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print(f"{'Hi':8s}")
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print(f"{123:8d}")
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print("{0:8s}".format("Hi"))
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print("{0:8d}".format(123))
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print("{0:2s}".format("Pythonista"))
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print(f"{'Hi':<8s}")
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print(f"{123:<8d}")
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print("{0:<8s}".format("Hi"))
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print("{0:<8d}".format(123))
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print(f"{'Hi':>8s}")
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print(f"{123:>8d}")
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print("{0:>8s}".format("Hi"))
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print("{0:>8d}".format(123))
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print(f"{'Hi':^8s}")
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print(f"{123:^8d}")
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print("{0:^8s}".format("Hi"))
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print("{0:^8d}".format(123))
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print(f"{123:+8d}")
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print(f"{-123:+8d}")
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print("{0:+8d}".format(123))
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print("{0:+8d}".format(-123))
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print(f"{123:=+8d}")
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print(f"{-123:=+8d}")
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print("{0:=+8d}".format(123))
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print("{0:=+8d}".format(-123))
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print(f"{'Hi':->8s}")
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print(f"{123:#<8d}")
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print(f"{'Hi':*^8s}")
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print("{0:->8s}".format("Hi"))
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print("{0:#<8d}".format(123))
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print("{0:*^8s}".format("Hi"))
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print(f"{123:+6d}")
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print(f"{-123:+6d}")
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print("{0:+6d}".format(123))
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print("{0:+6d}".format(-123))
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print(f"{123:-6d}")
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print(f"{-123:-6d}")
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print("{0:-6d}".format(123))
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print("{0:-6d}".format(-123))
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print(f"{123:*> 6d}")
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print(f"{-123:*> 6d}")
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print("{0:*> 6d}".format(123))
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print("{0:*> 6d}".format(-123))
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value = 16
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print(f"{value:b}, {value:#b}")
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print(f"{value:o}, {value:#o}")
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print(f"{value:x}, {value:#x}")
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print("{0:b}, {0:#b}".format(value))
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print("{0:o}, {0:#o}".format(value))
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print("{0:x}, {0:#x}".format(value))
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print(f"{123:.0f}, {123:#.0f}")
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print(f"{123:.0e}, {123:#.0e}")
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print("{0:.0f}, {0:#.0f}".format(123))
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print("{0:.0e}, {0:#.0e}".format(123))
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print(f"{123:05d}")
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print(f"{12.3:08.1f}")
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print("{0:05d}".format(123))
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print("{0:08.1f}".format(12.3))
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print(f"{'Hi':>06s}")
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print("{0:>06s}".format("Hi"))
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print(f"{123:*>05d}")
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print("{0:*>05d}".format(123))
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print(f"{1234567:,d}")
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print(f"{1234567:_d}")
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print(f"{1234567.89:,.2f}")
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print(f"{1234567.89:_.2f}")
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print("{0:,d}".format(1234567))
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print("{0:_d}".format(1234567))
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print("{0:,.2f}".format(1234567.89))
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print("{0:_.2f}".format(1234567.89))
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print(f"{0b111010100001:_b}")
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print(f"{0b111010100001:#_b}")
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print(f"{0xae123fcc8ab2:_x}")
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print(f"{0xae123fcc8ab2:#_x}")
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print("{0:_b}".format(0b111010100001))
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print("{0:#_b}".format(0b111010100001))
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print("{0:_x}".format(0xAE123FCC8AB2))
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print("{0:#_x}".format(0xAE123FCC8AB2))
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print(f"{1234.5678:8.2f}")
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print(f"{1.23:8.4f}")
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print(f"{1234.5678:8.2e}")
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print(f"{1.23:8.4e}")
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print("{0:8.2f}".format(1234.5678))
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print("{0:8.4f}".format(1.23))
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print("{0:8.2e}".format(1234.5678))
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print("{0:8.4e}".format(1.23))
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print(f"{'Pythonista':.6s}")
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print("{0:.6s}".format("Pythonista"))
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width = 10
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prec = 2
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print(f"{123.4567:{width}.{prec}f}")
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print("{2:{0}.{1}f}".format(width, prec, 123.4567))
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print(
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"{number:{width}.{prec}f}".format(width=width, prec=prec, number=123.4567)
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)

‎python-formatted-output/interpolation.py‎

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# print(f'Hello, Pythonista!')
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# print(f"Hello, Pythonista!")
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# print(f'Single-line f-string with single quotes')
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# print(f"Single-line f-string with double quotes")
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# print(
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# f'''Multiline triple-quoted f-string
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# with single quotes'''
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# )
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# print(
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# f"""Multiline triple-quoted f-string
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# with double quotes"""
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# )
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site = "Real Python"
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print(f"Welcome to {site}!")
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quantity = 6
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item = "bananas"
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price = 1.74
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print(f"{quantity} {item} cost ${price * quantity}")
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fruits = ["apple", "mango", "grape"]
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numbers = {"one": 1, "two": 2}
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print(f"First fruit in list is '{fruits[0]}'")
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print(f"Last two fruits in list are {fruits[-2:]}")
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print(f"Dict value for key 'one' is {numbers['one']}")
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lang = "Python"
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print(f"{{ {lang} }}")
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print("{0} {1} cost ${2}".format(6, "bananas", 1.74 * 6))
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print("{2}.{1}.{0}/{0}{0}.{1}{1}.{2}{2}".format("foo", "bar", "baz"))
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print("{} {} cost ${}".format(6, "bananas", 1.74 * 6))
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print(
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"{quantity} {item} cost ${cost}".format(
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quantity=6, item="bananas", cost=1.74 * 6
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)
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)
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print("{x} {y} {z}".format(x="foo", y="bar", z="baz"))
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print("{x} {y} {z}".format(x="foo", y="bar", z="baz"))

‎python-formatted-output/person.py‎

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class Person:
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def __init__(self, name, age):
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self.name = name
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self.age = age
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def __str__(self):
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return f"I'm {self.name}, and I'm {self.age} years old."
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def __repr__(self):
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return f"{type(self).__name__}(name='{self.name}', age={self.age})"
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jane = Person("Jane", 25)
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print(f"{jane!s}")
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print(f"{jane!r}")
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print("{jane!s}".format(jane=jane))
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print("{jane!r}".format(jane=jane))

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