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What is Python String Formatting and how to use it?

### Python String Formatting: An Overview

String formatting in Python allows you to **insert variables, values, or expressions** into strings dynamically. This is useful for constructing output or displaying information in a customized format.

There are three main ways to format strings in Python:

1. **`%` operator** (older method, similar to C-style formatting)

2. **`str.format()` method** (introduced in Python 3)

3. **f-strings** (formatted string literals, introduced in Python 3.6)

### 1. `%` Operator (Old Method)

The `%` operator allows you to insert variables into a string by using format specifiers (e.g., `%s`, `%d`, `%f`).

#### Syntax:

```python

"string with %specifier" % (values)

```

#### Example:

```python

name = "Alice"

age = 25

print("My name is %s and I am %d years old." % (name, age))

```

**Output:**

```

My name is Alice and I am 25 years old.

```

#### Common Format Specifiers:

- `%s` for strings

- `%d` for integers

- `%f` for floating-point numbers

- `%.2f` for floating-point numbers with two decimal places

#### Example with Floating-Point Numbers:

```python

pi = 3.14159

print("The value of pi is %.2f" % pi)

```

**Output:**

```

The value of pi is 3.14

```

### 2. `str.format()` Method (Newer Method)

The `str.format()` method is more powerful and flexible than the `%` operator. It allows you to insert variables by using curly braces `{}` as placeholders in a string.

#### Syntax:

```python

"string with {} placeholders".format(values)

```

#### Example:

```python

name = "Bob"

age = 30

print("My name is {} and I am {} years old.".format(name, age))

```

**Output:**

```

My name is Bob and I am 30 years old.

```

#### Positional and Keyword Arguments

You can specify the position of arguments or use named placeholders for more control.

##### Positional Arguments:

```python

print("My name is {0} and I am {1} years old.".format("Charlie", 35))

```

**Output:**

```

My name is Charlie and I am 35 years old.

```

##### Keyword Arguments:

```python

print("My name is {name} and I am {age} years old.".format(name="Dave", age=40))

```

**Output:**

```

My name is Dave and I am 40 years old.

```

#### Formatting Numbers with `str.format()`

You can control the formatting of numbers, such as specifying the number of decimal places or adding commas for large numbers.

##### Example: Floating-Point Precision

```python

pi = 3.14159

print("The value of pi is {:.2f}".format(pi))  # 2 decimal places

```

**Output:**

```

The value of pi is 3.14

```

##### Example: Adding Commas to Large Numbers

```python

large_number = 1000000

print("The large number is {:,}".format(large_number))

```

**Output:**

```

The large number is 1,000,000

```

### 3. F-Strings (Formatted String Literals)

**F-strings** (formatted string literals) are the most modern and concise way to format strings in Python. Introduced in Python 3.6, they allow you to directly embed expressions inside string literals by prefixing the string with an `f` or `F`.

#### Syntax:

```python

f"string with {variable} inside"

```

#### Example:

```python

name = "Eve"

age = 28

print(f"My name is {name} and I am {age} years old.")

```

**Output:**

```

My name is Eve and I am 28 years old.

```

F-strings evaluate expressions inside the curly braces `{}`, making them more flexible.

#### Example: Expressions in F-Strings

```python

num = 5

print(f"The square of {num} is {num**2}.")

```

**Output:**

```

The square of 5 is 25.

```

#### Formatting Numbers with F-Strings

You can also format numbers with F-strings, similar to `str.format()`.

##### Example: Floating-Point Precision

```python

pi = 3.14159

print(f"The value of pi is {pi:.2f}.")  # 2 decimal places

```

**Output:**

```

The value of pi is 3.14.

```

##### Example: Adding Commas to Large Numbers

```python

large_number = 1000000

print(f"The large number is {large_number:,}.")

```

**Output:**

```

The large number is 1,000,000.

```

### Advanced Formatting Options

#### Aligning Text and Numbers

You can control text alignment and padding with formatting options.

##### Left Align:

```python

name = "Alice"

print(f"|{name:<10}|")  # Left-align the text with a width of 10

```

**Output:**

```

|Alice     |

```

##### Right Align:

```python

print(f"|{name:>10}|")  # Right-align the text with a width of 10

```

 

**Output:**

```

|     Alice|

```

##### Center Align:

```python

print(f"|{name:^10}|")  # Center-align the text with a width of 10

```

**Output:**

```

|  Alice   |

```

#### Padding Numbers with Zeros

You can pad numbers with leading zeros using `:0` in the formatting options.

```python

number = 42

print(f"The number is {number:04}.")  # Pad with zeros to make it 4 digits

```

**Output:**

```

The number is 0042.

```

### Comparison of Formatting Methods

- **`%` operator**: Older and less flexible, but still works for simple tasks.

- **`str.format()`**: More powerful and flexible, especially for complex formatting.

- **F-strings**: The most modern, concise, and readable method, allowing direct embedding of expressions.

### Conclusion

- Use **F-strings** for simplicity, readability, and performance.

- Use **`str.format()`** for more complex formatting needs.

- Use the **`%` operator** only if you need compatibility with older Python code.

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