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
f string repr
# If you want to use repr in f-string use "!r" # Normal behavior (using str) >>> color = "blue\ngreen" >>> day = datetime.date(2020, 6, 4) >>> f"Color is {color} and day is {day}" 'Color is blue\ngreen and day is 2020-06-04' # Alternate behavior (using repr) >>> f"Color is {color!r} and day is {day!r}" "Color is 'blue\\ngreen' and day is datetime.date(2020, 6, 4)"
f string python
# f-string is a format for printing / returning data # It helps you to create more consise and elegant code ########### Example program ############## # User inputs their name (e.g. Michael Reeves) name = input() # Program welcomes the user print(f"Welcome to grepper {name}") ################ Output ################ """ E.g. Welcome to grepper Michael Reeves """
python f string
>>> name = "Eric" >>> age = 74 >>> f"Hello, {name}. You are {age}." 'Hello, Eric. You are 74.'
python f string literal
# This answer might be long, but it explains more python f-strings, how to use them and when to use them. # Python f-strings are used to write code faster. # Here is an example: name = "George" age = 16 favorite_food = "pizza" # Instead of doing this: print("My name is", name, ", my age is", age, ", and my favorite food is", favorite_food) # Or this: print("My name is "+ name +", my age is "+ str(age)+ ", and my favorite food is "+ favorite_food) # You could do this: print(f"My name is {name}, my age is {age}, and my favorite food is {favorite_food}") # You see that the code looks a little cleaner, and as you start using f-strings you realize you write much faster. """ Why put the f before the string, you ask? Well if you didnt, the output would literally be {name} instead of the actual variable One more thing: this is fairly new and only works with python 3.6 and higher. """
python f-strings
>>> 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" '
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