Python programming language. String Formatting
auf dem Kanal: YouRails
Learn essential methods for formatting strings, numbers, and dates in Python.
Unlock the power of Python string formatting! Discover basic methods like %, str.format(), and f-strings. Learn to use positional and keyword arguments, align text, format numbers, and handle dates. Enhance your code with internationalization tips for locale-aware formatting.
Chapters:
00:00 Title Card
00:02 Basic String Formatting Methods
Summary:
Use % operator for simple substitutions
str.format() for complex formatting
f-strings for embedding expressionsUsing % operator
name = "Alice"
greet = "Hello, %s!" % name
Using str.format()
greet = "Hello, {}!".format(name)
Using f-strings
greet = f"Hello, {name}!"
00:04 Positional & Keyword Arguments
Summary:
Utilize positional arguments with str.format()
Employ keyword arguments for clarity
F-strings support named expressions"{} is {} years old".format(
"Alice", 30)
"{name} is a {job}".format(
name="Bob",
job="builder")
f"{user} logged in"
00:06 Alignment & Padding Techniques
Summary:
Align text using spaces or characters
Use format specifiers for alignment
Apply padding for uniform appearancename = "Alice"
print("{:❮10}".format(name))
print("{:❯10}".format(name))
print("{:^10}".format(name))
print("{:*^10}".format(name))
00:08 Number Formatting Options
Summary:
Control decimal places precisely
Add thousands separator for clarity
Use scientific notation when necessarynum = 12345.6789
print(
"{:.2f}".format(num))
print(
"{:,}".format(num))
print(
"{:.2e}".format(num))
00:10 Date & Time Formatting Techniques
Summary:
Format dates using strftime
Embed date expressions in f-strings
Customize time display formatsfrom datetime import datetime
now = datetime.now()
formatted_date = now.strftime(
"%Y-%m-%d")
print(f"Today is {formatted_date}")
custom_time = now.strftime(
"%H:%M:%S")
00:12 Internationalization in Formatting
Summary:
Handle locale-aware number formatting
Format dates according to locale
Ensure consistency across regionsimport locale
locale.setlocale(locale.LC_ALL, '')
from datetime import datetime
now = datetime.now()
formatted_date = now.strftime(
"%x")
formatted_number = locale.
format_string("%d", 1234567,
grouping=True)
00:14 End Card
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