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rcd_curr = {'SOUR:SAF:RCDC': {0.025: (?????), 0.25: (???????), 2.5: (???????)}}
for key 0.025 I need generate values from 0.020 with step 0.0001
for key 0.25 I need generate values from 0.21 with step 0.001
for key 2.5 I need generate values from 2.1 with step 0.01

import numpy as np
r1 = np.arange(0.020, 0.025, 0.0001)
for i in r1:
    print(i)

Output:
0.02
0.0201
0.0202
0.0203
0.020399999999999998
0.020499999999999997
0.020599999999999997
0.020699999999999996
0.020799999999999996
0.020899999999999995
0.020999999999999994
0.021099999999999994
0.021199999999999993
0.021299999999999993
0.021399999999999992
0.02149999999999999
0.02159999999999999
0.02169999999999999
0.02179999999999999
0.02189999999999999
0.02199999999999999
0.022099999999999988
0.022199999999999987
0.022299999999999986
0.022399999999999986
0.022499999999999985
0.022599999999999985
0.022699999999999984
0.022799999999999983
0.022899999999999983
0.022999999999999982
0.02309999999999998
0.02319999999999998
0.02329999999999998
0.02339999999999998
0.02349999999999998
0.02359999999999998
0.023699999999999978
0.023799999999999977
0.023899999999999977
0.023999999999999976
0.024099999999999976
0.024199999999999975
0.024299999999999974
0.024399999999999974
0.024499999999999973
0.024599999999999973
0.024699999999999972
0.02479999999999997
0.02489999999999997
0.02499999999999997

import pprint

group1 = []
group2 = []
group3 = []

for value in range(200, 251, 1):
    group1.append(round(value*0.0001, 4))
    if value >= 210:
        group2.append(round(value*0.001, 3))
        group3.append(round(value*0.01, 2))


rcd_curr = {'SOUR:SAF:RCDC': {0.025: tuple(
    group1), 0.25: tuple(group2), 2.5: tuple(group3)}}

pprint.pprint(rcd_curr)

Output:
{'SOUR:SAF:RCDC': {0.025: (0.02,
                           0.0201,
                           0.0202,
                           0.0203,
                           0.0204,
                           0.0205,
                           0.0206,
                           0.0207,
                           0.0208,
                           0.0209,
                           0.021, 
                           0.0211,
                           0.0212,
                           0.0213,
                           0.0214,
                           0.0215,
                           0.0216,
                           0.0217,
                           0.0218,
                           0.0219,
                           0.022,
                           0.0221,
                           0.0222,
                           0.0223,
                           0.0224,
                           0.0225,
                           0.0226,
                           0.0227,
                           0.0228,
                           0.0229,
                           0.023,
                           0.0231,
                           0.0232,
                           0.0233,
                           0.0234,
                           0.0235,
                           0.0236,
                           0.0237,
                           0.0238,
                           0.0239,
                           0.024,
                           0.0241,
                           0.0242,
                           0.0243,
                           0.0244,
                           0.0245,
                           0.0246,
                           0.0247,
                           0.0248,
                           0.0249,
                           0.025),
                   0.25: (0.21,
                          0.211,
                          0.212,
                          0.213,
                          0.214,
                          0.215,
                          0.216,
                          0.217,
                          0.218,
                          0.219,
                          0.22,
                          0.221,
                          0.222,
                          0.223,
                          0.224,
                          0.225,
                          0.226,
                          0.227,
                          0.228,
                          0.229,
                          0.23,
                          0.231,
                          0.232,
                          0.233,
                          0.234,
                          0.235,
                          0.236,
                          0.237,
                          0.238,
                          0.239,
                          0.24,
                          0.241,
                          0.242,
                          0.243,
                          0.244,
                          0.245,
                          0.246,
                          0.247,
                          0.248,
                          0.249,
                          0.25),
                   2.5: (2.1,
                         2.11,
                         2.12,
                         2.13,
                         2.14,
                         2.15,
                         2.16,
                         2.17,
                         2.18,
                         2.19,
                         2.2,
                         2.21,
                         2.22,
                         2.23,
                         2.24,
                         2.25,
                         2.26,
                         2.27,
                         2.28,
                         2.29,
                         2.3,
                         2.31,
                         2.32,
                         2.33,
                         2.34,
                         2.35,
                         2.36,
                         2.37,
                         2.38,
                         2.39,
                         2.4,
                         2.41,
                         2.42,
                         2.43,
                         2.44,
                         2.45,
                         2.46,
                         2.47,
                         2.48,
                         2.49,
                         2.5)}}