Significant digits in an csv file

New to Julia
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3

FWIW, in case this helps.
The numbers are loaded as strings for processing the digits and parsed to floats later:

using CSV, DataFrames

const input="""
date,tmax
1-Jan-2000,5.7E3
2-Feb-2001,31.88700
3-Mar-2002,100e0
4-Apr-2003,100.1
"""

df = DataFrame(CSV.File(IOBuffer(input), types=Dict(:date=>String, :tmax=>String)))

str = split.(string.(first.(split.(lowercase.(df.tmax),'e'))),'.')
df.sdigs = zeros(Int, nrow(df))
for (i,s) in pairs(str)
    df.sdigs[i] = length(s[1])
    (length(s)>1) && (df.sdigs[i] += length(rstrip(s[2],'0')))
end
df.tmax = parse.(Float64, df.tmax)
df

# Result:
 Row │ date        tmax      sdigs 
     │ String      Float64   Int64
─────┼─────────────────────────────
   1 │ 1-Jan-2000  5700.0        2
   2 │ 2-Feb-2001    31.887      5
   3 │ 3-Mar-2002   100.0        3
   4 │ 4-Apr-2003   100.1        4
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