Jassif Team Institution

Error Example

age = 36
# This will produce an error:
txt = "My name is John, I am " + age
print(txt)
# TypeError: can only concatenate str to str

F-String Example

# Create an f-string
age = 36
txt = f"My name is John, I am {age}"
print(txt)  # Output: My name is John, I am 36

Basic Placeholder Example

# Add a placeholder for the price variable
price = 59
txt = f"The price is {price} dollars"
print(txt)  # Output: The price is 59 dollars

Format Modifier Example

# Display the price with 2 decimals
price = 59
txt = f"The price is {price:.2f} dollars"
print(txt)  # Output: The price is 59.00 dollars

Operations in Placeholders Example

# Perform a math operation in the placeholder
txt = f"The price is {20 * 59} dollars"
print(txt)  # Output: The price is 1180 dollars

# Complex expressions
a = 10
b = 20
txt = f"The sum is {a + b} and product is {a * b}"
print(txt)  # Output: The sum is 30 and product is 200

# Function calls
name = "john"
txt = f"Name in uppercase: {name.upper()}"
print(txt)  # Output: Name in uppercase: JOHN

# Multiple operations
items = 5
price_per_item = 12.5
txt = f"Total: ${items * price_per_item:.2f}"
print(txt)  # Output: Total: $62.50

# Combine multiple modifiers
number = 1234567.8912

# Currency with 2 decimals and thousand separators
print(f"${number:,.2f}")  # Output: $1,234,567.89

# Percentage with 1 decimal
percentage = 0.856
print(f"{percentage:.1%}")  # Output: 85.6%

# Scientific notation
print(f"{number:.2e}")  # Output: 1.23e+06

# Different width and alignment
name = "Python"
print(f"|{name:<20}|")  # Output: |Python              |
print(f"|{name:>20}|")  # Output: |              Python|
print(f"|{name:^20}|")  # Output: |       Python       |

# Conditional expressions in f-strings
score = 85
grade = f"Score: {score} - {'Pass' if score >= 50 else 'Fail'}"
print(grade)  # Output: Score: 85 - Pass

# Multiple conditions
temperature = 22
feeling = f"It feels {'hot' if temperature > 30 else 'warm' if temperature > 20 else 'cool'}"
print(feeling)  # Output: It feels warm

# Formatting based on value
value = 42
formatted = f"Value: {value:0>5}"  # Pad with zeros to width 5
print(formatted)  # Output: Value: 00042