python memorandum (sequential update)
item
- When you want to use a character string as a code (assignment statement)
eval - When you want to overlap two with hist and make one transparent
.hist (alpha = 0.5) - I want to use the square root!
`math.sqrt (x)` - I want to make a list that numpy can use as it is! ``
np.array ([0, 1, 2])` - etc...
1. When you want to use a character string as a code (assignment statement) eval
A so-called assignment statement that can use the character string inside as a code with eval ("~~~ ")?
python
list = ["dog","cat"]
dog, cat = "wan", "nya"
for i in list:
print(eval(i))
# wan
# nya
2. When you want to overlap two with hist and make one transparent .hist (alpha = 0.5)
.hist (alpha =?) Makes it transparent, 1 ~ 0 makes it darker as it gets closer to 1, and 0.0 makes it completely transparent.
python
x = np.random.randn(10000)
plt.hist(x, alpha =0.5)
plt.hist(x - 2, alpha = 0.5)
plt.show
3. I want to use the square root! math.sqrt (x)
I want to use the square root easily! In such a case, use math to.sqrt (x)!
python
import math
print(math.sqrt(4))
print(math.sqrt(144))
# 2.0
# 12.0
4. I want to make a list that numpy can use as it is! Np.array ([0, 1, 2])
By creating a list with np.array ([list of int]), you can apply the numpy module to the list as it is.
python
x = np.array([812, 973, 1001])
np.max(x)
# 1001
5.etc...
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