bekomme bei
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data5 = pd.merge(data0, data1, how='left', left_on=['Code'], right_on=['Code'])
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ValueError: You are trying to merge on int64 and object columns. If you wish to proceed you should use pd.concat
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data1['Code'].astype(int)
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File "pandas/_libs/lib.pyx", line 614, in pandas._libs.lib.astype_intsafe
ValueError: invalid literal for int() with base 10: '11.06.2020'