Indentation in Python
Unlike many other programming languages, Python uses indentation to define code blocks instead of braces {} or keywords. This makes indentation not just stylistic, but syntactically required.
Microsoft Copilot
2026年2月25日星期三
Operators in Python
Double asterisk in Python: exponentiation operator
print(10 % 3) # 1 (because 10 = 3*3 + 1)
print(25 % 7) # 4 (because 25 = 7*3 + 4)
The operator <= means “less than or equal to.”
Python has two membership operators that test whether a value is present in a sequence (like a list, tuple, string, or set) or a mapping (like a dictionary).
d = {"x": 10, "y": 20}
print("x" in d) # True
print(10 in d) # False (10 is a value, not a key)
Microsoft Copilot
Trans fat and cholesterol profile
Trans fats raise “bad” LDL cholesterol and often lower “good” HDL cholesterol, creating one of the worst possible cholesterol profiles for your heart and blood vessels. Even small amounts in the diet are linked to higher rates of heart attack and death from heart disease.
Head‑to‑head trials suggest trans fats disturb the cholesterol profile at least as much as, and in some ways more than, cholesterol‑raising saturated fats. Unlike most saturated fats, trans fats both increase LDL and lower HDL, which makes their overall effect on the LDL/HDL ratio particularly harmful. Because of this pattern, expert groups describe trans fats as the most damaging dietary fat per gram for cardiovascular health.
Deep Research using Perplexity.ai
拉之眼
The Eye of Ra is a powerful ancient Egyptian symbol representing the sun god Ra's protective yet destructive force. While it shares a similar "wedjat" design with the Eye of Horus, the Eye of Ra is traditionally depicted as the right eye and symbolizes solar energy, royal authority, and divine retribution.
Google AI overview
2026年2月24日星期二
Data structures of Python
Lists are ordered collections. Sets are unordered collections.
A tuple is one of the built-in data types used to store collections of items. It’s similar to a list but with a key difference: tuples are immutable, meaning once created, their elements cannot be changed, added, or removed.
immutable: that cannot be changed; that will never change
Similarities of sets and dictionaries:
- Both can be modified after creation
- Both are defined with curly brackets
- Both are unordered collections
Source mainly from Microsoft Copilot
v > c
Tachyons are hypothetical subatomic particles that always travel faster than the speed of light. Proposed to exist within the framework of special relativity, they possess imaginary mass and would speed up as they lose energy, requiring infinite energy to slow down to light speed. No experimental evidence confirms their existence.
Google AI Overview
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