python - Solve the error : could not convert string to float: '0.1222000000*10e1' - 


expo2 = ['0.1222000000*10e1', '0.9310000000*10e-1', '0.2580000000*10e1', '0.2580000000*10e1', '0.2580000000*10e1', '0.8850000000*10e-1', '0.8850000000*10e-1', '0.8850000000*10e-1', '0.8850000000*10e0', '0.8850000000*10e0', '0.8850000000*10e0', '0.8850000000*10e0', '0.8850000000*10e0', '0.1222000000*10e1', '0.9310000000*10e-1', '0.2580000000*10e1', '0.2580000000*10e1', '0.2580000000*10e1', '0.8850000000*10e-1', '0.8850000000*10e-1', '0.8850000000*10e-1', '0.8850000000*10e0', '0.8850000000*10e0', '0.8850000000*10e0', '0.8850000000*10e0', '0.8850000000*10e0']

i have list of numbers. use them, tried use float commands but, when wrote:

print(float(expo2[0]))

i got error message:

valueerror: not convert string float: '0.1222000000*10e1'

how can convert numbers floats?

i think correct formula:

expo2 = ['0.1222000000*10e1', '0.9310000000*10e-1', '0.2580000000*10e1', '0.2580000000*10e1', '0.2580000000*10e1', '0.8850000000*10e-1', '0.8850000000*10e-1', '0.8850000000*10e-1', '0.8850000000*10e0', '0.8850000000*10e0', '0.8850000000*10e0', '0.8850000000*10e0', '0.8850000000*10e0', '0.1222000000*10e1', '0.9310000000*10e-1', '0.2580000000*10e1', '0.2580000000*10e1', '0.2580000000*10e1', '0.8850000000*10e-1', '0.8850000000*10e-1', '0.8850000000*10e-1', '0.8850000000*10e0', '0.8850000000*10e0', '0.8850000000*10e0', '0.8850000000*10e0', '0.8850000000*10e0']   floats = [] f in expo2:     try:         a, e = f.split("*")         floats.append(float(a) * float(e))     except valueerror e:         print("not float") print(floats)  [12.22, 0.931, 25.8, 25.8, 25.8, 0.885, 0.885, 0.885, 8.85, 8.85, 8.85, 8.85, 8.85, 12.22, 0.931, 25.8, 25.8, 25.8, 0.885, 0.885, 0.885, 8.85, 8.85, 8.85, 8.85, 8.85]

you can verify using eval:

print(all(a == eval(b) a,b in zip(floats, expo2))) true

10e-1 1 10e1 100:

in [25]: 10e-1 out[25]: 1.0     in [26]: 10e-2  out[26]: 0.1 in [27]: 10e-3 out[27]: 0.01     in [28]: 10e1 # 10 * 10^1 -> 10 * 10  out[28]: 100.0     in [29]: 10e2 # 10 * 10^2 -> 10 * 10 * 10 out[29]: 1000.0    in [30]: 10e3 # 10 * 10^3 -> 10 * 10 * 10 * 10 out[30]: 10000.0

a table this site using 1.0 coefficient:

1.0 coefficient  10 base  n exponent  1.0*10e-24= 0.000,000,000,000,000,000,000,001 or yocto  1.0*10e-21= 0.000,000,000,000,000,000,001 or zepto  1.0*10e-18= 0.000,000,000,000,000,001 or 1 quintillionth, alto  1.0*10e-15= 0.000,000,000,000,001 or 1 quadrillionth, femto  1.0*10e-12= 0.000,000,000,001 or 1 trillionth, pico  1.0*10e-11= 0.000,000,000,01  1.0*10e-10= 0.000,000,000,1  1.0*10e-09= 0.000,000,001 or 1 billionth, nano  1.0*10e-08= 0.000,000,01  1.0*10e-07= 0.000,000,1  1.0*10e-06= 0.000,001 or 1 millionth, micro  1.0*10e-05= 0.000,01  1.0*10e-04= 0.000,1  1.0*10e-03= 0.001 or 1 thousandth, milli  1.0*10e-02= 0.01 or centi  1.0*10e-01= 0.1 or deci  1.0*10e00= 1 or units or (v,i,r,p,)(meter,liter,gram,)(seconds)ƒ(herz cycles)  1.0*10e01= 10 or deka  1.0*10e02= 100 or hecto  1.0*10e03= 1,000 or kilo  1.0*10e04= 10,000 or (10k)  1.0*10e05= 100,000 or (100k)  1.0*10e06= 1,000,000 or mega  1.0*10e07= 10,000,000 or (10m)  1.0*10e08= 100,000,000 or (100m)  1.0*10e09= 1,000,000,000 or giga  1.0*10e12= 100,000 000,000 or tera  1.0*10e15= 100,000,000,000,000 or peta  1.0*10e18= 100,000,000,000,000,000 or exa  1.0*10e21= 100,000,000,000,000,000,000 or zetta  1.0*10e24= 100,000,000,000,000,000,000,000 or yotta

if have mixture:

expo2 = ['0.1222000000*10e2', "1.0", "4r", "2.123e4", '0.9310000000*10e-1', '0.2580000000*10e1',"foo"]  floats = []   f in expo2:     try:         a, e = f.split("*")         floats.append(float(a) * float(e))     except valueerror:         try:             floats.append(float(f))         except valueerror e:             print(e)  not convert string float: '4r' not convert string float: 'foo' [122.2, 1.0, 21230.0, 0.931, 25.8]

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