[5ec3a0b] | 1 | import re |
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[53bb3e5] | 2 | from datetime import datetime |
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| 3 | from decimal import Decimal |
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| 4 | from shutil import copyfileobj |
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| 5 | |
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[5ec3a0b] | 6 | from unidecode import unidecode |
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| 7 | from xml.dom import minidom |
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[53bb3e5] | 8 | from ZODB.blob import Blob |
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[5ec3a0b] | 9 | |
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| 10 | |
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| 11 | def slugify(text, delim=u'-'): |
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| 12 | """ |
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| 13 | Generates an ASCII-only slug. |
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| 14 | from http://flask.pocoo.org/snippets/5/ |
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| 15 | """ |
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| 16 | _punct_re = re.compile(r'[\t !"#$%&\'()*\-/<=>?@\[\\\]^_`{|},.]+') |
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| 17 | result = [] |
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| 18 | text = unidecode(text) |
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| 19 | for word in _punct_re.split(text.lower()): |
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| 20 | result.extend(word.split()) |
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| 21 | return delim.join(result) |
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| 22 | |
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| 23 | |
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| 24 | class GPXMinidomParser(object): |
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| 25 | """ |
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| 26 | GPX parser, using minidom from the base library. |
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| 27 | |
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| 28 | We need this as a workaround, as gpxpy does not handle GPX 1.1 extensions |
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| 29 | correctly right now (and we have not been able to fix it). |
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| 30 | |
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| 31 | This method is inspired by this blog post: |
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| 32 | |
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| 33 | http://castfortwo.blogspot.com.au/2014/06/ |
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| 34 | parsing-strava-gpx-file-with-python.html |
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| 35 | """ |
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| 36 | |
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| 37 | def __init__(self, gpx_path): |
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| 38 | self.gpx_path = gpx_path |
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| 39 | self.gpx = None |
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| 40 | self.tracks = {} |
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| 41 | |
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| 42 | def load_gpx(self): |
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| 43 | """ |
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| 44 | Load the given gpx file into a minidom doc, normalize it and set |
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| 45 | self.gpx to the document root so we can reuse it later on |
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| 46 | """ |
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| 47 | doc = minidom.parse(self.gpx_path) |
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| 48 | doc.normalize() |
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| 49 | self.gpx = doc.documentElement |
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| 50 | |
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| 51 | def parse_tracks(self): |
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| 52 | """ |
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| 53 | Loop over all the tracks found in the gpx, parsing them |
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| 54 | """ |
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| 55 | for trk in self.gpx.getElementsByTagName('trk'): |
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| 56 | self.parse_track(trk) |
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| 57 | |
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| 58 | def parse_track(self, trk): |
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| 59 | """ |
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| 60 | Parse the given track, extracting all the information and putting it |
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| 61 | into a dict where the key is the track name and the value is a list |
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| 62 | of data for the the different segments and points in the track. |
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| 63 | |
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| 64 | All the data is saved in self.tracks |
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| 65 | """ |
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| 66 | name = trk.getElementsByTagName('name')[0].firstChild.data |
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| 67 | if name not in self.tracks: |
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| 68 | self.tracks[name] = [] |
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| 69 | |
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| 70 | for trkseg in trk.getElementsByTagName('trkseg'): |
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| 71 | for trkpt in trkseg.getElementsByTagName('trkpt'): |
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| 72 | lat = Decimal(trkpt.getAttribute('lat')) |
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| 73 | lon = Decimal(trkpt.getAttribute('lon')) |
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| 74 | |
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| 75 | # There could happen there is no elevation data |
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| 76 | ele = trkpt.getElementsByTagName('ele') |
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| 77 | if ele: |
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| 78 | ele = Decimal(ele[0].firstChild.data) |
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| 79 | else: |
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| 80 | ele = None |
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| 81 | |
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| 82 | rfc3339 = trkpt.getElementsByTagName('time')[0].firstChild.data |
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| 83 | try: |
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[53bb3e5] | 84 | t = datetime.strptime( |
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[5ec3a0b] | 85 | rfc3339, '%Y-%m-%dT%H:%M:%S.%fZ') |
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| 86 | except ValueError: |
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[53bb3e5] | 87 | t = datetime.strptime( |
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[5ec3a0b] | 88 | rfc3339, '%Y-%m-%dT%H:%M:%SZ') |
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| 89 | |
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| 90 | hr = None |
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| 91 | cad = None |
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| 92 | atemp = None |
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| 93 | extensions = trkpt.getElementsByTagName('extensions') |
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| 94 | if extensions: |
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| 95 | extensions = extensions[0] |
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| 96 | trkPtExt = extensions.getElementsByTagName( |
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| 97 | 'gpxtpx:TrackPointExtension')[0] |
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| 98 | if trkPtExt: |
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| 99 | hr_ext = trkPtExt.getElementsByTagName('gpxtpx:hr') |
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| 100 | cad_ext = trkPtExt.getElementsByTagName('gpxtpx:cad') |
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| 101 | atemp_ext = trkPtExt.getElementsByTagName( |
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| 102 | 'gpxtpx:atemp') |
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| 103 | if hr_ext: |
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| 104 | hr = Decimal(hr_ext[0].firstChild.data) |
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| 105 | if cad_ext: |
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| 106 | cad = Decimal(cad_ext[0].firstChild.data) |
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| 107 | if atemp_ext: |
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| 108 | atemp = Decimal(atemp_ext[0].firstChild.data) |
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| 109 | |
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| 110 | self.tracks[name].append({ |
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| 111 | 'lat': lat, |
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| 112 | 'lon': lon, |
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| 113 | 'ele': ele, |
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| 114 | 'time': t, |
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| 115 | 'hr': hr, |
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| 116 | 'cad': cad, |
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| 117 | 'atemp': atemp}) |
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[53bb3e5] | 118 | |
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| 119 | |
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| 120 | def semicircles_to_degrees(semicircles): |
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| 121 | return semicircles * (180 / pow(2, 31)) |
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| 122 | |
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| 123 | |
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| 124 | def degrees_to_semicircles(degrees): |
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| 125 | return degrees * (pow(2, 31) / 180) |
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| 126 | |
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| 127 | |
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| 128 | def miles_to_kms(miles): |
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| 129 | factor = 0.62137119 |
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| 130 | return miles / factor |
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| 131 | |
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| 132 | |
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| 133 | def kms_to_miles(kms): |
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| 134 | factor = 0.62137119 |
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| 135 | return kms * factor |
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| 136 | |
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| 137 | |
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| 138 | def meters_to_kms(meters): |
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| 139 | return meters / 1000 |
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| 140 | |
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| 141 | |
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| 142 | def kms_to_meters(kms): |
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| 143 | return kms * 1000 |
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| 144 | |
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| 145 | |
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| 146 | def mps_to_kmph(mps): |
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| 147 | """ |
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| 148 | Transform a value from meters-per-second to kilometers-per-hour |
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| 149 | """ |
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| 150 | return mps * 3.6 |
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| 151 | |
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| 152 | |
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| 153 | def kmph_to_mps(kmph): |
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| 154 | """ |
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| 155 | Transform a value from kilometers-per-hour to meters-per-second |
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| 156 | """ |
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| 157 | return kmph * 0.277778 |
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| 158 | |
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| 159 | |
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| 160 | def copy_blob(blob): |
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| 161 | """ |
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| 162 | Create a copy of a blob object, returning another blob object that is |
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| 163 | the copy of the given blob file. |
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| 164 | """ |
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| 165 | new_blob = Blob() |
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| 166 | if getattr(blob, 'file_extension', None): |
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| 167 | new_blob.file_extension = blob.file_extension |
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| 168 | with blob.open('r') as orig_blob, new_blob.open('w') as dest_blob: |
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| 169 | orig_blob.seek(0) |
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| 170 | copyfileobj(orig_blob, dest_blob) |
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| 171 | return new_blob |
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| 172 | |
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| 173 | |
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| 174 | def create_blob(data, file_extension): |
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| 175 | """ |
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| 176 | Create a ZODB blob file from some data, return the blob object |
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| 177 | """ |
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| 178 | blob = Blob() |
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| 179 | blob.file_extension = file_extension |
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| 180 | with blob.open('w') as open_blob: |
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| 181 | # use .encode() to convert the string to bytes if needed |
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| 182 | if not isinstance(data, bytes): |
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| 183 | data = data.encode('utf-8') |
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| 184 | open_blob.write(data) |
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| 185 | return blob |
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