python f string

>>> name = "Eric"
>>> age = 74
>>> f"Hello, {name}. You are {age}."
'Hello, Eric. You are 74.'

"""

An f-string stands for 'function string' it's just used to work with 
strings more appropiately, they do the exact same job as concantenating
strings but are more efficient and readable.

"""
# Concantenating strings:

Age=25

print("I am "+Age+" years old.")

# Using f strings:

Age=25

print(f"I am {Age} years old.")

# ^ notice the letter 'f' at the begining of the string.
# That defines that it is an f-string.

#python3.6 is required
age = 12
name = "Simon"
print(f"Hi! My name is {name} and I am {age} years old")

>>> name = "Fred"
>>> f"He said his name is {name!r}."
"He said his name is 'Fred'."
>>> f"He said his name is {repr(name)}."  # repr() is equivalent to !r
"He said his name is 'Fred'."
>>> width = 10
>>> precision = 4
>>> value = decimal.Decimal("12.34567")
>>> f"result: {value:{width}.{precision}}"  # nested fields
'result:      12.35'
>>> today = datetime(year=2017, month=1, day=27)
>>> f"{today:%B %d, %Y}"  # using date format specifier
'January 27, 2017'
>>> f"{today=:%B %d, %Y}" # using date format specifier and debugging
'today=January 27, 2017'
>>> number = 1024
>>> f"{number:#0x}"  # using integer format specifier
'0x400'
>>> foo = "bar"
>>> f"{ foo = }" # preserves whitespace
" foo = 'bar'"
>>> line = "The mill's closed"
>>> f"{line = }"
'line = "The mill\'s closed"'
>>> f"{line = :20}"
"line = The mill's closed   "
>>> f"{line = !r:20}"
'line = "The mill\'s closed" '

import random
name = input("What is your name? ") #Gets needed input
value = int(input(f"Give random value, {name}: ")) # The {name} means it puts the variable name there
multiplier = random.randint(3, 6)
print("Now multiplying your value...")
complete_value = multiplier * value
print(f"Your value is... {complete_value}") # Same here with complete_value

# 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

>>> name = "Eric"
>>> age = 74
>>> f"Hello, {name}. You are {age}."
'Hello, Eric. You are 74.'

# f-strings help in string concatenation
name = 'Psych4_3.8.3'
age = 23
job = 'programmer'

#USING OLD METHOD
print("I am %s a %t of age %u", %(name, job, age))

# USING F-STRING
print(f"I am {name} a {job} of age {age}")
# here you can even see whcih value is inserted in which place....
# the f means that it is an f string. DONT FORGET IT!!

f-strings were added in python 3.6.
In older python versions, an f-string will result in a syntax error.
If you don't want to (or can't) upgrade, 
see How do I put a variable inside a String in Python?
for alternatives to f-strings.

import math

print('[[fill]align]                | f\'{"text":10}\'      | ', f'{"text":10}')        # text
print('[[fill]align]                | f\'{"text":>10}\'     | ', f'{"text":>10}')       #       text
print('[[fill]align]                | f\'{"text":^10}\'     | ', f'{"text":^10}')       #    text
print('[[fill]align]                | f\'{"text":#>10}\'    | ', f'{"text":#>10}')      # ######text
print('[[fill]align]                | f\'{"text":#<10}\'    | ', f'{"text":#<10}')      # text######
print('[[fill]align]                | f\'{"text":#^10}\'    | ', f'{"text":#^10}')      # ###text###
print('[[fill]align] with numbers   | f\'{12345:0=10}\'     | ', f'{12345:0=10}')       # 0000012345
print('[[fill]align] with numbers   | f\'{-12345:0=10}\'    | ', f'{-12345:0=10}')      # -000012345      
print('[[fill]align] with numbers   | f\'{12345:010}\'      | ', f'{12345:010}')        # 0000012345
print('[[fill]align] with numbers   | f\'{-12345:010}\'     | ', f'{-12345:010}')       # -000012345
print('[.precision]                 | f\'{math.pi:.2f}\'    | ', f'{math.pi:.2f}')      # 3.14
print('[grouping_option]            | f\'{1000000:,.2f}\'   | ', f'{1000000:,.2f}')     # 1,000,000.00
print('[grouping_option]            | f\'{1000000:_.2f}\'   | ', f'{1000000:_.2f}')     # 1_000_000.00
print('[sign] (+/-)                 | f\'{12345:+}\'        | ', f'{12345:+}')          # +12345
print('[sign] (+/-)                 | f\'{-12345:+}\'       | ', f'{-12345:+}')         # -12345
print('[sign] (+/-)                 | f\'{12345:+10}\'      | ', f'{12345:+10}')        #     +12345
print('[sign] (+/-)                 | f\'{-12345:+10}\'     | ', f'{-12345:+10}')       #     -12345
print('[sign] (+/-)                 | f\'{12345:+010}\'     | ', f'{12345:+010}')       # +000012345
print('[sign] (+/-)                 | f\'{-12345:+010}\'    | ', f'{-12345:+010}')      # -000012345
print('[b] (binary)                 | f\'{10:b}\'           | ', f'{10:b}')             # 1010
print('[o] (octal)                  | f\'{10:o}\'           | ', f'{10:o}')             # 12
print('[x] (hexadecimal)            | f\'{100:x}\'          | ', f'{100:x}')            # 64
print('[#b] (with notation base)    | f\'{10:#b}\'          | ', f'{10:#b}')            # 0b1010
print('[#0] (with notation base)    | f\'{10:#o}\'          | ', f'{10:#o}')            # 0o12
print('[#x] (with notation base)    | f\'{10:#x}\'          | ', f'{10:#x}')            # 0xa
print('[e] (scientific notation)    | f\'{345600000000:e}\' | ', f'{345600000000:e}')   # 3.456000e+11
print('[c] (character type)         | f\'{65:c}\'           | ', f'{65:c}')             # A
print('percentage (multiply by 100) | f\'{0.25:0%}\'        | ', f'{0.25:0%}')          # 25.000000%
print('percentage (multiply by 100) | f\'{0.25:.0%}\'       | ', f'{0.25:.0%}')         # 25%