Chuỗi f (formatted string literal)

Regular Expressions in Python

Maria Eugenia Inzaugarat

Data Scientist

f-strings

way = "code"
method = "learning Python faster"
print(f"Practicing how to {way} is the best method for {method}")

Practicing how to code is the best method for learning Python faster

Chuyển đổi cho phép:
- !s (phiên bản chuỗi)
- !r (chuỗi dạng biểu diễn có thể in, tức là có dấu nháy)
- !a (như !r nhưng escape ký tự ngoài ASCII)

name = "Python"

print(f"Python is called {name!r} due to a comedy series")

Python is called 'Python' due to a comedy series

Định dạng chuẩn:
- e (ký pháp khoa học, vd 5 10^3)
- d (số nguyên, vd 4)
- f (số thực, vd 4.5353)

number = 90.41890417471841

print(f"In the last 2 years, {number:.2f}% of the data was produced worldwide!")

In the last 2 years, 90.42% of the data was produced worldwide!

from datetime import datetime
my_today = datetime.now()

print(f"Today's date is {my_today:%B %d, %Y}")

Today's date is April 14, 2019

family = {"dad": "John", "siblings": "Peter"}

print("Is your dad called {family[dad]}?".format(family=family))

Is your dad called John?

print(f"Is your dad called {family[dad]}?")

NameError: name 'dad' is not defined

print("My dad is called "John"")

SyntaxError: invalid syntax

my_string = "My dad is called \"John\""

My dad is called "John"

family = {"dad": "John", "siblings": "Peter"}

print(f"Is your dad called {family[\"dad\"]}?")

SyntaxError: f-string expression part cannot include a backslash

print(f"Is your dad called {family['dad']}?")

Is your dad called John?

my_number = 4
my_multiplier = 7

print(f'{my_number} multiplied by {my_multiplier} is {my_number * my_multiplier}')

4 multiplied by 7 is 28

def my_function(a, b):
  return a + b

print(f"If you sum up 10 and 20 the result is {my_function(10, 20)}")

If you sum up 10 and 20 the result is 30

Regular Expressions in Python