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rejection sampling method. Create a 4 digit random combination from 10 digits and resample if it doesn't match the criteria.

r4=0    
while r4 < 1000:
    r4=int(''.join(map(str,random.sample(range(10),4))))

noticed that this is essentially the same as @Austin Haskings's answer

rejection sampling method. Create a 4 digit random combination from 10 digits and resample if it doesn't match the criteria.

r4=0    
while r4 < 1000:
    r4=int(''.join(map(str,random.sample(range(10),4))))

noticed that this is essentially the same as @Austin Haskings's answer

sample-rejection method. Create a 4 digit random combination from 10 digits and resample if it doesn't match the criteria.

r4=0    
while r4 < 1000:
    r4=int(''.join(map(str,random.sample(range(10),4))))

noticed that it's the same as @Austin Haskings's answer

rejection sampling method. Create a 4 digit random combination from 10 digits and resample if it doesn't match the criteria.

r4=0    
while r4 < 1000:
    r4=int(''.join(map(str,random.sample(range(10),4))))

noticed that this is essentially the same as @Austin Haskings's answer

sample-rejection method. Create a 4 digit random combination from 10 digits and resample if it doesn't match the criteria.

r4=0    
while r4 < 1000:
    r4=int(''.join(map(str,random.sample(range(10),4))))

sample-rejection method. Create a 4 digit random combination from 10 digits and resample if it doesn't match the criteria.

r4=0    
while r4 < 1000:
    r4=int(''.join(map(str,random.sample(range(10),4))))

noticed that it's the same as @Austin Haskings's answer