Tzane

跟着 if/else in a list comprehension 你可以这样做:

my_list = ['abc_apple','abc_orange','cherry','abc_berry','banana']
my_list = [f"abc_{word}" if not word.startswith("abc_") else word for word in my_list]
print(my_list)

输出:

['abc_apple', 'abc_orange', 'abc_cherry', 'abc_berry', 'abc_banana']

下面是一个示例脚本,用于计算多项式的导数和根。我没有包括csv读/写,因为我不确定您使用的确切格式。

from sympy import Symbol, Poly

# Define symbols
x = Symbol("x")

# Add csv reading here
input_rows = [
    [2.234, 0, 0.523, 2.3123, 4.123],
    [2, 2, 2, 2, 2]]

output_rows = []

# Iterate over each row
for r in input_rows:
    # Create polynomial from coefficients
    y = Poly(r, x)
    print(y)
    # 1st derivative and its roots
    y_dx = y.diff(x)
    y_dx_roots = y_dx.nroots()
    # 2nd derivative and its roots
    y_ddx = y_dx.diff(x)
    y_ddx_roots = y_ddx.nroots()
    # Write results to list of dicts
    output_rows.append({
        "1st deriv": y_dx.all_coeffs(),
        "2nd deriv": y_ddx.all_coeffs(),
        "1st deriv roots": y_dx_roots,
        "2nd deriv roots": y_ddx_roots})

print(*output_rows, sep="\n")

您可以检查密钥是否已存在于中 main_dict 具有 if "stats" not in main_dict ,只需将“stats”替换为您想要检查的任何键即可。下面是一个简单的片段:

command = {
    "uniq_ip_1" : ["time", "threshold_counter"],
    "unique_ip_2": ["time", "threshold_counter"]}

main_dict = {}

if "stats" not in main_dict:
    main_dict["stats"] = command

print(main_dict)

if "stats" not in main_dict:
    main_dict["stats"] = command

print(main_dict)