Preface
In Python, print(f'') is the syntax for formatting strings (f-string), which allows you to embed expressions in strings that are replaced by their values at runtime. The f or F prefix means that this is a formatted string literal. Inside braces {} in f'' or F'', you can put any valid Python expression. When the print function is executed, these expressions are evaluated and the result is inserted into the corresponding position of the string.
Here are some usesprint(f'')Example:
Example 1: Basic usage
name = "Alice"
print(f"Hello, {name}!") # Output：Hello, Alice!Example 2: Arithmetic operation
x = 5
y = 10
print(f"The sum of {x} and {y} is {x + y}.") # Output：The sum of 5 and 10 is 15.Example 3: Accessing dictionary elements
person = {"name": "Bob", "age": 30}
print(f"{person['name']} is {person['age']} years old.") # Output：Bob is 30 years old.Example 4: Using functions
def square(x):
return x ** 2
number = 4
print(f"The square of {number} is {square(number)}.") # Output：The square of 4 is 16.Example 5: Format numbers (usually used to retain the decimal places of floating point numbers.)
pi = 3.141592653589793
print(f"The value of pi is approximately {pi:.2f}.") # Output：The value of pi is approximately 3.14.In the last example above,:.2fis a format specifier that tells Python to convert floating point numberspiFormatted as a string with two decimals.
Format strings provide a concise and readable way to interpolate and format strings, especially when you need to embed variables or perform simple calculations. With traditional string formatting methods (e.g.%operator or()Compared with method), f-string is usually more intuitive and convenient.
Attachment: Floating point output format
Code example:
a = 3.141592654
b = 12.138
print(a)
print(b)
print(f"Pi ≈ {a}")
print("%f" % a)
print("%f" % b)
3.141592654
12.138
Pi ≈ 3.141592654
3.141593
12.138000
When using print only to output floating point numbers with more than six decimal places, the value will not be changed.
You can refer to the first three print functions
When using %f to specify output, it will automatically default to six decimal places
i) If it is insufficient, add 0 until six decimal places are filled
ii) If more than six decimal places are exceeded, the rounding strategy will be used
Summarize
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