Identifikatsiya operatorlari ma'lumotlarning xotira birligini aniqlash uchun ishlatiladi.
Xotira... Python xotirani hisobga olmaydi deyishadiku? CPython ob'ektlari xotirani boshqarishni optimallashtirish uchun juda ko'p xotiradan foydalanadi.Bunga misol CPython -5 dan 256 gacha bo'lgan barcha butun sonlarning global ro'yxatini saqlaydi va bularning hammasi uchun 266 * 24 = 6384 baytni oldindan ajratadi.
Ma'lumotlar turi nima u? Ma'lumotlar turiga namunalar: str satr 'salom' int butun sonlar 2 float haqiqiy sonlar 2.03 bool mantiqiy True yoki False
a = 28 b = 19 a va b o'zgaruvchi 28 va 19 ma'lumot ma'lumot turi int
a va b o'zgaruvchilar ma'lumot turi bir xil lekin xotirada joylashuvi farq qilishi mumkin. Ma'lumot xotirada joylashishini ko'rish uchun id() funktsiyasidan foydalanamiz.
is - Agar ikkala o'zgaruvchi bir xil ob'ekt bo'lsa rost (True) qaytaradi, boshqa holatda yolg'on (False) qaytaradi
print(a is b) False print(True is False) False print(False is False) True print(True is True) True
is not - Agar ikkala o'zgaruvchi bir xil ob'ekt bo'lmasa rost (True) qaytaradi, boshqa holatda yolg'on (False) qaytaradi print(a is not b) True a = 5 b = 5 print(a is not b) False
Identifikatsiya operatorlari ma'lumotlarning xotira birligini aniqlash uchun ishlatiladi.
Xotira... Python xotirani hisobga olmaydi deyishadiku? CPython ob'ektlari xotirani boshqarishni optimallashtirish uchun juda ko'p xotiradan foydalanadi.Bunga misol CPython -5 dan 256 gacha bo'lgan barcha butun sonlarning global ro'yxatini saqlaydi va bularning hammasi uchun 266 * 24 = 6384 baytni oldindan ajratadi.
Ma'lumotlar turi nima u? Ma'lumotlar turiga namunalar: str satr 'salom' int butun sonlar 2 float haqiqiy sonlar 2.03 bool mantiqiy True yoki False
a = 28 b = 19 a va b o'zgaruvchi 28 va 19 ma'lumot ma'lumot turi int
a va b o'zgaruvchilar ma'lumot turi bir xil lekin xotirada joylashuvi farq qilishi mumkin. Ma'lumot xotirada joylashishini ko'rish uchun id() funktsiyasidan foydalanamiz.
is - Agar ikkala o'zgaruvchi bir xil ob'ekt bo'lsa rost (True) qaytaradi, boshqa holatda yolg'on (False) qaytaradi
print(a is b) False print(True is False) False print(False is False) True print(True is True) True
is not - Agar ikkala o'zgaruvchi bir xil ob'ekt bo'lmasa rost (True) qaytaradi, boshqa holatda yolg'on (False) qaytaradi print(a is not b) True a = 5 b = 5 print(a is not b) False
The SSE was the first modern stock exchange to open in China, with trading commencing in 1990. It has now grown to become the largest stock exchange in Asia and the third-largest in the world by market capitalization, which stood at RMB 50.6 trillion (US$7.8 trillion) as of September 2021. Stocks (both A-shares and B-shares), bonds, funds, and derivatives are traded on the exchange. The SEE has two trading boards, the Main Board and the Science and Technology Innovation Board, the latter more commonly known as the STAR Market. The Main Board mainly hosts large, well-established Chinese companies and lists both A-shares and B-shares.
Spiking bond yields driving sharp losses in tech stocks
A spike in interest rates since the start of the year has accelerated a rotation out of high-growth technology stocks and into value stocks poised to benefit from a reopening of the economy. The Nasdaq has fallen more than 10% over the past month as the Dow has soared to record highs, with a spike in the 10-year US Treasury yield acting as the main catalyst. It recently surged to a cycle high of more than 1.60% after starting the year below 1%. But according to Jim Paulsen, the Leuthold Group's chief investment strategist, rising interest rates do not represent a long-term threat to the stock market. Paulsen expects the 10-year yield to cross 2% by the end of the year.
A spike in interest rates and its impact on the stock market depends on the economic backdrop, according to Paulsen. Rising interest rates amid a strengthening economy "may prove no challenge at all for stocks," Paulsen said.
