13 Amazing Python Features You Might Not Know

Python is a top programming language with many hidden features that many developers never use. This article shares thirteen such Python features.

1. List Stepping – Use the step slice parameter to skip elements or reverse a list.

<code># 列表Stepping
data = [10, 20, 30, 40, 50]
print(data[::2])  # [10, 30, 50]
print(data[::3])  # [10, 40]
print(data[::-1]) # [50, 40, 30, 20, 10]
</code>

2. find() Method – Locate the start index of a substring.

<code># 查找方法
x = "Python"
y = "Hello From Python"
print(x.find("Python"))   # 0
print(y.find("From"))     # 6
print(y.find("From Python")) # 6
</code>

3. iter() Function – Create an iterator from an iterable without a loop.

<code># Iter()
values = [1, 3, 4, 6]
values = iter(values)
print(next(values))  # 1
print(next(values))  # 3
print(next(values))  # 4
print(next(values))  # 6
</code>

4. Doctest – Write tests inside docstrings and run them with doctest.testmod .

<code># Doctest
from doctest import testmod

def Mul(x, y) -> int:
    """
    >>> Mul(4, 5)
    20
    >>> Mul(19, 20)
    380
    """
    return x * y

testmod(name='Mul', verbose=True)
</code>

5. Yield Statement – Similar to return but produces a generator that can be resumed.

<code># Yield声明
def func():
    print(1)
    yield 1
    print(2)
    yield 2
    print(3)
    yield 3

for value in func():
    pass  # outputs 1, 2, 3
</code>

6. Handling Missing Dictionary Keys – Use dict.get() instead of direct indexing to avoid KeyError .

<code># 处理字典中的缺失值
dict_1 = {1: "x", 2: "y"}
print(dict_1.get(3))  # None
</code>

7. For/Else and While/Else – else runs after a loop completes without break .

<code># 为/否则
for x in range(5):
    print(x)
else:
    print("Loop Completed")

i = 0
while i < 5:
    break
else:
    print("Loop Completed")  # not executed
</code>

8. Named String Formatting – Use str.format() or f‑strings to insert values.

<code># 命名格式化字符串
a = "Python"
b = "Job"
string = "I looking for a {} Programming {}".format(a, b)
print(string)  # I looking for a Python Programming Job

string = f"I looking for a {a} Programming {b}"
print(string)
</code>

9. Setting Recursion Limit – Adjust Python's recursion depth with sys.setrecursionlimit() .

<code># 设置递归限制
import sys
sys.setrecursionlimit(2000)
print(sys.getrecursionlimit())  # 2000
</code>

10. Conditional (Ternary) Expression – Assign values based on a condition in a single line.

<code># 条件参数
x = 5 if 2 > 4 else 2  # 2
print(x)

y = 10 if 32 > 41 else 24  # 24
print(y)
</code>

11. Argument Unpacking – Use * and ** to unpack iterables and dictionaries into function arguments.

<code># 参数解包
def func(x, y):
    print(x, y)
list_1 = [100, 200]
dict_1 = {'x': 300, 'y': 400}
func(*list_1)
func(**dict_1)
</code>

12. Hello World Shortcut – Importing __hello__ prints a friendly message.

<code># Hello World!
import __hello__
</code>

13. Multiline Strings Without Triple Quotes – Concatenate strings across lines using backslashes.

<code># 多行字符串
str1 = "你是否正在寻找免费的Python学习材料" \
       "欢迎来到 " \
       "公众号 关于数据分析与可视化"
print(str1)
</code>

The article concludes with a call‑to‑action offering free Python learning resources via a QR code.