What does {: 3f mean in python?
(Sponsors) Get started learning Python with DataCamp's free Intro to Python tutorial. Learn Data Science by completing interactive coding challenges and watching videos by expert instructors. Start Now! Show Updated on Jan 07, 2020 The Syntax: template is a string containing format codes, >>> 'Sam has {0} red balls and {1} yellow balls'.format(12, 31)
Expected Output: Sam has 12 red balls and 31 yellow balls This technique is okay for simple formatting but what if you want to specify precision in floating point number? For such thing you need to learn more about format codes. Here is the full syntax of format codes. Syntax:
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Following examples will make things more clear. Example 1: >>> "Floating point {0:.2f}".format(345.7916732) Here we specify Expected Output: Example 2:
Here we specify Expected Output: Example 3: "Floating point pi = {0:.3f}, with {1:d} digit precision".format(math.pi, 3) Here Expected Output: Floating point pi = 3.142, with 3 digit precision You need to specify precision only in case of floating point numbers if you specify precision for integer Example 5: 'Sam has {1:d} red balls and {0:d} yellow balls'.format(12, 31) Expected Output: Sam has 31 red balls and 12 yellow balls Example 6: "In binary 4 is {0:b}".format(4) # b for binary, refer to Fig 1.1 Expected Output: Example 7:
Expected Output: Example 8:
Expected Output: Sam had 122 hats and 42 mats The 'Sam has {red} red balls and {green} yellow balls'.format(red = 12, green = 31) Note while using keyword arguments we need to use arguments inside You can also mix position arguments with keywords arguments
The Let's take an example. "%d pens cost = %.2f" % (12, 150.87612) Here we are using template string on the left of So Expected Output: Some more examples. Example 1: New: "{0:d} {1:d} ".format(12, 31) Old: Expected Output: Example 2: New: "{0:.2f} {1:.3f}".format(12.3152, 89.65431) Old: "%.2f %.3f" % (12.3152, 89.65431) Expected Output: Example 3: New: "{0:s} {1:o} {2:.2f} {3:d}".format("Hello", 71, 45836.12589, 45 ) Old: "%s %o %.2f %d" % ("Hello", 71, 45836.12589, 45 ) Expected Output: Other Tutorials (Sponsors) This site generously supported by DataCamp. DataCamp offers online interactive Python Tutorials for Data Science. Join over a million other learners and get started learning Python for data science today! What does {: 2f mean in Python?2f means to round up to two decimal places. You can play around with the code to see what happens as you change the number in the formatter. ADVERTISEMENT.
What does {: D mean in Python?It is a formatting character. It tells the formatter to treat the argument as an integer number and format it as such. Other valid formatters could be x to format it as a hexadecimal number, or b for binary, etc.
What does 5f mean in Python?5f' means round to 5 places after the decimal point. Similarly '. 2f' means round to two decimal places. This format function returns the formatted string.
What is format {: B in Python?The b" notation is used to specify a bytes string in Python. Compared to the regular strings, which have ASCII characters, the bytes string is an array of byte variables where each hexadecimal element has a value between 0 and 255.
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