TypeError: 'str' object is not callable

This means you’re trying to call a string as if it were a function — using () on something that’s a string, not a function.

Fix 1: You named a variable str

The most common cause. You accidentally overwrote Python’s built-in str() function:

# ❌ This shadows the built-in str()
str = "hello"
number = 42
text = str(number)  # TypeError! str is now "hello", not the function

# ✅ Don't use 'str' as a variable name
message = "hello"
number = 42
text = str(number)  # Works: "42"

Same problem with other built-ins: list, dict, int, float, type, input, print.

Quick fix — restart your Python session or delete the variable:

del str  # Restores the built-in

Fix 2: Using parentheses instead of brackets

# ❌ Parentheses = function call
name = "hello"
first_char = name(0)  # TypeError!

# ✅ Brackets = indexing
first_char = name[0]  # "h"

Fix 3: Missing an operator

# ❌ Python thinks you're calling the string
greeting = "hello" "world"(x)  # Confusing syntax

# ✅ Be explicit
greeting = "hello" + "world"

Fix 4: Calling a property that’s a string

class User:
    name = "Alice"

user = User()

# ❌ name is a string, not a method
user.name()  # TypeError!

# ✅ Access it as a property
print(user.name)  # "Alice"

How to debug

Add a type check before the failing line:

print(type(str))  # Should be <class 'type'>, not <class 'str'>

If it prints <class 'str'>, you’ve overwritten the built-in somewhere above.

Related resources

• Python cheat sheet
• Python complete guide