extract first letter of column python
df['new_col'] = df['First'].astype(str).str[0]
df
Out[29]:
First Second new_col
0 123 234 1
1 22 4353 2
2 32 355 3
3 453 453 4
4 45 345 4
5 453 453 4
6 56 56 5read only the first line python
""" Read only the first line of a file """
with open('file.txt') as f:
first_line = f.readline()
print(first_line)
""" or """
f = open ('file.txt', 'r')
first_line = f.readline()
print (first_line)Copyright © 2021 Codeinu
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